• To decide their nominees for president, Democrats and Republicans use a system of delegates.
  • The delegates are people represent their states at national party conventions. The candidate who gets the support of a majority of delegates becomes that party’s presidential nominee.
  • It’s even more confounding than it sounds, and Democratic candidates must master a confusing morass of calendar conflicts and loyalties if they want to run against President Donald Trump in November.
  • Trump himself is all but sure to become the Republican party presidential nominee in 2020, given his widespread support in his own party.
  • Here’s the breakdown of how the process works, state by state.
  • Visit Business Insider’s homepage for more stories.

Winning a presidential nomination isn’t as simple as winning the most votes.

Both Democrats and Republicans use a complicated delegate process to choose their nominees. Winning candidates must secure a majority of delegates – people who represent their state at national party conventions.

It’s a confusing system, mixing delegates who are proportioned by Congressional districts and delegates who are allocated based on votes across the entire state.

Republicans and Democrats have different rules that determine how each party’s delegates are chosen. President Donald Trump currently commands the support of 86% of GOP primary voters and several state party organizations have already canceled their primaries, so it’s all but certain that he will be the Republican presidential nominee in 2020. But the Democrat who wants to compete with him in November but still navigate a mathematically complicated morass of elections and rack up delegates across the country before the convention in July.

The number of delegates varies from state to state. In the Democratic primaries, California has the most with 415 delegates, while New York has 274 and Texas has 228. On the other end of the spectrum, US territories like Guam and American Samoa, which do not vote in the general election, have six or seven each for the primary. They might not sound like much, but when the competition is close, they can be vital.

In addition to those "pledged" delegates, the Democratic primary also features "unpledged" delegates - or "superdelegates" - who are now mainly ornamental. These "superdelegates" vote for whichever candidate they want at the party convention in the unlikely instance that there isn't an agreed-upon nominee on the first ballot. While "superdelegates" were consequential in the 2016 race, the Democratic National Committee has since stripped them of much of their powers, and they mainly serve as a ticket to the Democratic National Convention for elected officials and DNC members.

The Democratic National Committee will decide on the final delegate allocation from each congressional district sometime early this year. But for the time being, these are the best estimates, from the Green Papers and documents provided by the DNC.

Here's how each Democratic state party decides its delegates and when their ballots close. The path begins in Iowa, which is a helpful example to show how the specific allocations break down.


Iowa — February 3

Foto: Voters cast ballots at the West Des Moines Fire Station 18 in West Des Moines, Iowa.sourceScott Morgan / Reuters

Iowa has a closed caucus, meaning people can only vote in the primaries for the party where they're registered, so only Democrats will be voting in the Democratic primary.

The state has 41 delegates overall.

27 are allocated by the state's four congressional districts. Of those 27, seven delegates will be elected in the first congressional district, another seven from the second congressional, eight in the third congressional, and five in the fourth congressional.

There are 14 "at large" delegates, meaning they represent the entire state and are allocated to each candidate in proportion with their statewide support. Five of those are "PLEO" delegates, who are earmarked as "party leaders and elected officials"

Iowa has an additional eight "unpledged PLEOs," or "superdelegates." In the highly unlikely event that the Democratic party hasn't decided on a winner by the convention, these "superdelegates" may vote for whatever candidate they want. Otherwise, they mainly exist to hang out at the convention.


New Hampshire — February 11

Foto: A voter exits a voting booth in the village of Groveton, New Hampshire.sourceMike Segar / Reuters

New Hampshire has a modified version of an open primary. The meaning of a "modified primary" can vary between states, but it generally means that people can vote regardless of their political party, with a few restrictions that are ostensibly designed to keep voting fair.

It has 24 delegates overall. 16 of them are allocated by the state's two congressional districts.

Eight of the delegates are at large, three of which are PLEOs. The state has an additional nine superdelegates.


Nevada — February 22

Foto: Voting signs near the Las Vegas Strip in Nevada.sourceEric Thayer / Reuters

Nevada has a closed caucus, meaning that only Democrats can vote in it.

The state has 36 delegates. 23 are allocated by congressional district.

13 delegates are at large, eight of which are PLEO. It also has 12 superdelegates.


South Carolina — February 29

Foto: A voter leaves after voting in the U.S. Republican presidential primary at a polling station in Charleston, South CarolinasourceChris Keane / Reuters

South Carolina has an open primary, which means that anyone can vote regardless of their party registration.

The state has 54 delegates overall, 35 of which are allocated by congressional district.

19 of the delegates are at large, with seven of them as PLEO. The state also has nine superdelegates.


Alabama — March 3

Foto: Voters wait to cast their vote in Tuscaloosa, Alabama.sourceButch Dill / AP

Alabama has an open primary and 52 delegates overall.

34 delegates are allocated by congressional district and 18 are at large. Seven of those at large delegates are PLEO pledged.

The state also has nine superdelegates.


American Samoa — March 3

Foto: Vice President Mike Pence stands with his wife Karen as they pose for a photo with officials and U.S. service members during a refueling stop in Pago Pago, American Samoa,sourceKen Thomas / AP

While voters in American Samoa cannot vote in the general elections, they can vote in presidential primaries.

The territory has an open primary with six delegates, which are all at large. It also has five superdelegates.


Arkansas — March 3

Foto: Early voting in Little Rock, Arkansas.sourceKelly P. Kissel / AP

Arkansas has an open primary and 31 delegates

20 are allocated by congressional district and 11 are at large, of which four are PLEO pledged. The state also has five superdelegates.


California — March 3

Foto: A passing surfer is reflected on the window as voters cast their ballots in Hermosa Beach, California.sourceDavid McNew/Reuters

California has a modified primary.

It has 415 delegates, the most of any state. 271 are allocated by congressional district and 144 are at large. Of those 144, 54 are PLEO pledged. California also has 79 superdelegates.


Colorado — March 3

Foto: A voter fills out her ballot in Denver, Colorado.sourceDavid Zalubowski / AP

Colorado has a modified primary with 67 delegates, 44 of which are allocated by congressional districts

The state has 23 at large delegates nine of which are PLEO pledged. The state also has 13 superdelegates.


Democrats Abroad — March 3

Foto: Guests attend a reception organized by the Italian Democrats AbroadsourceAndrew Medichini / AP

Democrats living overseas have an open caucus for themselves that also begins voting on "Super Tuesday." The group gets 13 delegates, all of which are at large and one of which is PLEO pledged. They also get four superdelegates.


Maine — March 3

Foto: A handmade sign stuck in a snowbank in Searsmont, Maine.sourceRobert F. Bukaty / AP

Maine has a closed primary. It has 24 delegates, 16 of which are allocated by the state's two congressional districts.

The state has eight at large delegates, three of which are PLEO Pledged.

Maine also has eight superdelegates.


Massachusetts — March 3

Foto: A woman who did not wish to be identified leaves a polling station after having voted in the East Boston neighborhood of Boston, Massachusetts.sourceMichael Dwyer / AP

Massachusetts has a modified primary. It has 91 delegates, 59 of which are allocated by congressional districts

The state also has 32 at large delegates, 12 of which are PLEO pledged. It also has 23 superdelegates.


Minnesota — March 3

Foto: Minnesota voters register in MinneapolissourceEric Miller / Reuters

Minnesota has a closed primary with 75 delegates

49 of them are allocated by congressional district and 26 are at large, 10 of which are PLEO pledged. Minnesota also has 17 superdelegates.


North Carolina — March 3

Foto: A voter casts her ballot in Smithfield, North Carolina.sourceChris Keane / Reuters

North Carolina has a modified primary with 110 delegates.

72 are allocated by congressional district and 38 are at large. Of the at large delegates, 14 are PLEO pledged. The state also has 12 superdelegates.


Oklahoma — March 3

Foto: Voters wait in line to cast their ballots at a historic schoolhouse in Stillwater, Oklahoma.sourceThomson Reuters

Oklahoma has a modified primary. It has 37 delegates, 24 of which are allocated by congressional district.

The state has 13 at large delegates, five of which are PLEO pledged. It also has five superdelegates.


Tennessee — March 3

Foto: Voters check in at a school gymnasium on election day in Nashville, Tennessee.sourceMark Humphrey / AP

Tennessee has an open primary. It has 64 delegates overall, 42 of which are allocated by congressional districts. Another 22 are at-large, eight of which are PLEO-pledged. The state also has nine superdelegates.


Texas - March 3

Foto: Shoppers pass a line of voters at a grocery story which is also serving as a polling site for the Texas primary elections in Austin.sourceEric Gay / AP

Texas has a closed primary. The state has 228 delegates, among the most of any state. 149 are allocated by congressional district. Another 79 are at large, 30 of which are PLEO pledged. Texas also has 34 superdelegates.


Utah - March 3

Foto: People vote at the polling place in Krishna Temple during election day in Salt Lake City, Utah.sourceRick Bowmer / AP

Utah has a closed primary for its 29 delegates. 19 of them are allocated by congressional district, and 10 are at large, four of which are PLEO pledged. The state also has six superdelegates


Vermont - March 3

Foto: People arrive to vote in the midterm elections in Brandon, Vermont.sourceCaleb Kenna / Reuters

Vermont has an open primary with 16 delegates. 11 are allocated by congressional district and five are at large, 2 of which are PLEO pledged. The state also has seven superdelegates.


Virginia - March 3

Foto: A man exits after voting during the midterm election at Philomont Fire Station, in Purcellville, Virginia.sourceAl Drago / Reuters

Virginia has an open primary for its. 99 delegates. Of them, 65 are allocated by congressional district and 34 are at large, 13 of which are PLEO pledged. The state also has 25 superdelegates.


Idaho - March 10

Foto: A voter fills out a ballot at the Boise Senior Center during the primary election in Boise, Idaho.sourceOtto Kitsinger / AP

Idaho has a closed primary and 20 delegates, 13 of which allocated by congressional district. Another seven delegates are at large, three of which are PLEO pledged. Idaho has an additional five superdelegates.


Michigan — March 10

Foto: Voters at a voting place for the midterm election in Detroit, Michigan, November 6, 2018.sourceREUTERS/Rebecca Cook

Michigan has an open primary with 125 delegates.

82 of them are allocated by congressional district and 43 are at large, 16 of which are PLEO pledged.

Michigan also has 22 superdelegates.


Mississippi - March 10

Foto: Voters in Ridgeland, Mississippi.sourceRogelio V. Solis / AP

Mississippi has an open primary. It has 36 delegates, 23 of which are allocated by congressional district. Another 13 are at large, five of which are PLEO pledged. The state also has five superdelegates.


Missouri — March 10

Foto: Voters in Stockton, Missouri.sourceCharlie Riedel / AP

Missouri has an open primary. It has 68 delegates, 44 of which are allocated by congressional district.

Another 24 delegates are at large, nine of which are PLEO pledged. Missouri has 10 superdelegates.


North Dakota – March 10

Foto: Residents of Williston, N.D., fill look over their ballots at the city's community center.sourceCharles Rex Arbogast / AP

North Dakota has an open caucus for its 14 delegates. Of those delegates, nine are allocated by congressional district, and five are at large, two of which are PLEO pledged. The state has another four superdelegates.


Washington — March 10

Foto: Voters line up in the rain outside Bright Family and Youth Center in the Columbia Heights neighborhood in Washington.sourcePablo Martinez Monsivais / AP

The state of Washington has a closed primary.

It has 89 delegates, 58 of which are allocated by congressional district. Another 31 are at large, 12 of which are PLEO pledged.

The state also has 18 superdelegates.


Northern Marianas Islands — March 14

Foto: Delegates from the Northern Mariana Islands wear flowers during the Democratic National Convention in Philadelphia, PennsylvaniasourceLucy Nicholson / Reuters

The Commonwealth of the Northern Mariana Islands, a US territory, has a closed caucus. It has six delegates, all of them are at large, in addition to five superdelegates.


Arizona — March 17

Foto: People wait in line to vote in the primary Tuesday, March 22, 2016, in Chandler, Ariz.sourceDavid Kadlubowski/The Arizona Republic via AP

Arizona has a closed primary. It has 67 delegates: 44 are allocated by congressional district and 23 at large. Of those, nine are PLEO pledged. It also has 11 superdelegates.


Florida — March 17

Foto: Voters cast their ballots at the Miami-Dade County, Florida.sourceWilfredo Lee / AP

Florida has a closed primary. It has 219 delegates, making it one of the most important states in the primary season. Of those delegates, 143 are allocated by congressional district and 76 are at large. Of the at large delegates, 29 are PLEO pledged. The state also has 29 superdelegates.


Illinois – March 17

Foto: A voter casts his ballot at Marie's Golden Cue in Chicago, Illinois.sourceJim Young / Reuters

Illinois has an open primary for its 155 delegates. 101 of them are allocated by congressional district and 54 are at large, of which 20 are PLEO pledged. Illinois also has 29 superdelegates.


Ohio — March 17

Foto: Canvassing member registers a voter in the Over The Rhine neighborhood of Cincinnati, Ohio,sourceWilliam Philpott / Reuters

Ohio has a modified primary. It has 136 delegates, 89 of which are allocated by congressional district. 47 delegates are at large, 18 of which are PLEO pledged. It has 17 superdelegates.


Georgia — March 24

Foto: A voter smiles as she marks her ballot at a Fulton County polling place in Atlanta, Georgia.sourceLeah Millis / Reuters

Georgia has an open primary with 105 delegates. Of those 105, 68 are allocated by congressional districts and 37 are at large, of which 14 are PLEO pledged. The state has another 15 superdelegates.


Puerto Rico — March 29

Foto: Puerto Rican citizens wait in line to vote in San Juan.sourceCarlos Giusti / AP

Puerto Rico, a US commonwealth, holds an open primary. It has 51 delegates, 33 of which are allocated by congressional district. Another 18 are at large, seven of which are PLEO pledged. It also has eight superdelegates.


Alaska — April 4

Foto: Voters line up outside a polling place in Anchorage, Alaska.sourceMichael Dinneen / AP

Alaska has a closed primary. It has 15 delegates, nine of which are allocated by its congressional district. Another six are at large, two of which are PLEO pledged. It also has four superdelegates.


Hawaii — April 4

Foto: Voters crowd the voting tables during the Hawaii caucus at Kailua Intermediary School, in Kailua, Hawaii.sourceMarco Garcia / AP

Hawaii has a closed primary for its 24 delegates. Of them, 15 are allocated by congressional district and nine are at large, three of which are PLEO pledged. It has another nine superdelegates.


Louisiana — April 4

Foto: Voters line up to cast their vote in New Orleans, Louisiana.sourceGerald Hebert / AP

Louisiana has a closed primary. It has 54 delegates, 35 of which are allocated by congressional district. 189 are at large, seven of which are PLEO pledged. In addition, it has seven superdelegates.


Wyoming — April 4

Foto: Large numbers of caucuses goers cast their vote the Civic Center in Cheyenne, Wyoming.sourceRJ Sangosti / The Denver Post / Getty

Wyoming has a closed caucus. It has 14 delegates, eight of which are allocated by its congressional district. Another six delegates are at large, two of which are PLEO pledged. And in addition to those, it has four superdelegates


Wisconsin — April 7

Foto: A student at the University of Wisconsin gets information about registering to vote.sourceScott Bauer / AP

Wisconsin has an open primary. It has 84 delegates, 55 allocated by congressional district. Another 29 delegates are at large, 10 of which are PLEO pledged. The state has another 13 superdelegates.


Connecticut — April 28

Foto: Voters line up at a voting station in Wolcott, Connecticut.sourceMichelle McLoughlin / Reuters

Connecticut has a closed primary for its 60 delegates. 40 of them are allocated by congressional district and 20 at large, of which six are PLEO pledged. It also has 15 superdelegates.


Delaware — April 28

Foto: A voter exits a voting booth after casting her ballot at the Charter School of Wilmington in Wilmington, Delaware.sourceTim Shaffer / Reuters

Delaware has a closed primary with a total of 21 delegates. 14 of them are allocated by congressional district and another seven are at large, two of which are PLEO pledged. It also has 15 superdelegates.


Maryland — April 28

Foto: Voters enter and exit a polling place in Middle River, Maryland.sourcePatrick Semansky / AP

Maryland has a closed primary for its 96 delegates. 65 of them are allocated by congressional district and another 31 are at large, 10 of which are PLEO pledged.

Maryland has another 23 superdelegates.


New York – April 28

Foto: A line of voters stretches around the block while waiting to cast their ballots at a polling site in New York.sourceDavid Goldman / AP

New York has a closed primary with 274 delegates. 184 are allocated by congressional district and another 90 are at large, of which 29 are PLEO pledged. New York also has 46 superdelegates.


Pennsylvania — April 28

Foto: A voter casts their ballot inside a hair salon during the U.S. presidential election in Philadelphia, Pennsylvania.sourceCharles Mostoller / Reuters

Pennsylvania has a closed primary. It has 186 delegates - 125 are allocated by congressional districts and 61 are at large, 20 of which are PLEO pledged. Pennsylvania also has 24 superdelegates.


Rhode Island — April 28

Foto: Voters stand outside the Dunkin Donuts Center, being used as a polling place in Providence, Rhode Island.sourceMatt O'Brien / AP

Rhode Island has a modified primary with 26 delegates. 18 are allocated by congressional districts and eight are at large, of which three are PLEO pledged. The state has nine superdelegates.


Guam — May 2

Foto: Guam delegates react as some delegates call for a roll call vote on the adoption of the rules during the opening day of the Republican National Convention.sourceJohn Locher / AP

The US territory Guam has a closed caucus with seven delegates, all of them at large and none PLEO pledged. It has another five superdelegates.


Kansas — May 2

Foto: Voters enters Kanwaka Township Hall, a polling place near Lawrence, Kansas.sourceOrlin Wagner / AP

Kansas has a closed primary. It has 39 delegates, 26 of which are allocated by congressional district. Another 13 are at large, four of which are PLEO pledged. The state also has six superdelegates.


Indiana — May 5

Indiana has an open primary with 82 delegates. 55 of them are allocated by congressional district and 27 are at large. Of the at large delegates, nine are PLEO pledged. The state also has seven superdelegates.


Nebraska — May 12

Foto: Early voters line up outside the Douglas County Election Commission's offices in Omaha, Nebraska.sourceNati Harnik / AP

Nebraska has a modified primary with 29 delegates. 20 of them are allocated by congressional district and nine are at large, of which three are PLEO pledged. It has another four superdelegates.


West Virginia — May 12

Foto: Carroll Terrance polling place in Charleston, West VirginiasourceLexi Browning / Reuters

West Virginia has a modified primary. It has 28 delegates, 19 of which are allocated by congressional district. Another nine are at large, of which three are PLEO pledged. The state also has six superdelegates.


Kentucky — May 19

Foto: Voters line up outside the Knicely Conference Center in Bowling Green Kentucky.sourceTimothy D. Easley / AP

Kentucky has a closed primary. It has 54 delegates, 36 of which are allocated by congressional district. Another 18 are at large, six of which are PLEO pledged. It also has six superdelegates.


Oregon — May 19

Foto: Elections volunteer points a voter to a designated ballot drop box in Lake Oswego, Oregon.sourceGillian Flaccus / AP

Oregon has a closed primary with 61 delegates. 41 of them are allocated by congressional district, and 20 are at large, of which seven are PLEO pledged. Oregon also has 14 superdelegates.


District of Columbia — June 2

Foto: Voters check in as District of Columbia voters head to the polls.sourceGary Cameron / Reuters

The District of Columbia, which encompasses Washington, DC, has a closed primary. It has 20 delegates, 13 of which are allocated by congressional district. Another seven are at large, of which two are PLEO pledged. The district also has 26 superdelegates.


Montana — June 2

Foto: A voter heads toward Springhill School in Belgrade, Montana.sourceJanie Osborne / AP

Montana has an open primary. It has 19 delegates. Of them, 13 are allocated by congressional district and, four are at large, of which two are PLEO pledged. The state has another six superdelegates.


New Jersey — June 2

Foto: Poll workers and voters in the Mendham Township in New Jersey.sourceMel Evans / AP

New Jersey has a modified primary with 126 delegates. 84 of them are allocated by congressional district and another 42 are at large, of which 14 are PLEO pledged. It also has 21 superdelegates.


New Mexico — June 2

Foto: Voters after casting their ballots in Albuquerque, New Mexico.sourceJuan Labreche / AP

New Mexico has a closed primary. It has 34 delegates. 23 are allocated by congressional district and another 11 are at large, of which four are PLEO pledged. The state also has 11 superdelegates.


South Dakota — June 2

Foto: Voters wait in line at the Pinedale Elementary School to vote in Rapid City in South Dakota.sourceToby Brusseau / AP

South Dakota has a modified primary with 16 delegates, 10 of which are allocated by congressional district. The state has six at large delegates, of which two are PLEO pledged. The state also has five superdelegates.


Virgin Islands — June 6

Foto: A woman holds up her child to cast a yellow ballot in the U.S. Virgin Islands.sourceBrennan Linsley / AP

The United States territory of the Virgin Islands closes out the delegate selection with its open primary.

It has seven delegates, all of which are at large and none of which are PLEO pledged, in addition to its six superdelegates.