Map of America showing where the primary states are for 2024 Election

Jim McMahon

Primary Matters

The presidential election is about to get underway. Here’s how the major parties choose their candidates.

Every four years, Americans select a president. Election 2024 officially kicks off this month with the Iowa caucuses on January 15. At press time, nine candidates were still vying for the Republican nomination, but former President Donald Trump held a wide lead in polls. The primary process determines which Republican will challenge President Biden—who hasn’t faced serious opposition for the Democratic nomination—in November’s general election.

Every four years, Americans select a president. Election 2024 officially kicks off this month with the Iowa caucuses on January 15. At press time, nine candidates were still vying for the Republican nomination. Former President Donald Trump held a wide lead in polls. The primary process determines which Republican will challenge President Biden in November’s general election. President Biden hasn’t faced serious opposition for the Democratic nomination.

How did this system come about?

Library of Congress

Joe Biden
President; seeking a second term

In the 19th and early 20th centuries, elected officials and party leaders chose presidential candidates without public input. Reformers began promoting primaries—elections to pick party nominees—saying party bosses were cutting backroom deals to select nominees. The first primaries occurred in the early 1900s, but it wasn’t until after World War II that they began to play a significant role in choosing candidates.

In the 19th and early 20th centuries, elected officials and party leaders chose presidential candidates without public input. Reformers were saying party bosses were cutting backroom deals to select nominees. So they began promoting primaries, which are elections to pick party nominees. The first primaries occurred in the early 1900s. But it wasn’t until after World War II that they began to play a significant role in choosing candidates.

What are primaries?

Official White House photo by Shealah Craighead

Donald Trump
Former President

A primary works very much like a general election. On dates selected by each state, the District of Columbia, and territories such as Puerto Rico and Guam, voters head to polling places to cast secret ballots. Based on the results, the state parties allocate delegates for each candidate to their national conventions, where presidential nominees are formally chosen. To win the nomination, a candidate must win a majority of the delegates at the party’s convention.

A primary works very much like a general election. On dates selected by each state, the District of Columbia, and territories such as Puerto Rico and Guam, voters head to polling places to cast secret ballots. Based on the results, the state parties allocate delegates for each candidate to their national conventions. Presidential nominees are formally chosen at the national convention. To win the nomination, a candidate must win a majority of the delegates at the party’s convention.

How are caucuses different?

Kimimasa Mayama/POOL/AFP via Getty Images

Ron DeSantis
Governor of Florida

Some states, like Iowa, have caucuses rather than primaries (see map, above). In caucuses, party members meet at the district or precinct level—gathering at schools, churches, and even private homes—to discuss the candidates and the issues. Then they publicly declare whom they’re supporting (usually by moving to a designated corner of the room). Iowa has about 1,700 precincts, each hosting its own caucus.

Some states, like Iowa, have caucuses rather than primaries (see map, above). In caucuses, party members meet at the district or precinct level to discuss the candidates and the issues. They gather at schools, churches, and even private homes. Then they publicly declare whom they’re supporting. Their support is usually shown by moving to a designated corner of the room. Iowa has about 1,700 precincts, each hosting its own caucus.

What’s the role of the conventions?

Mark Makela/Getty Images

Nikki Haley
Former Governor of South Carolina

In most recent elections, a candidate from each party has collected enough delegates in the primaries to all but guarantee the nomination. This has turned the conventions into little more than three-day-long TV ads for the candidates since the actual tallying of votes is just a formality. The last time there was a convention fight to win the majority of delegates’ support was in 1976, when President Gerald Ford narrowly beat Ronald Reagan to win the Republican nomination.

In most recent elections, a candidate from each party has collected enough delegates in the primaries to all but guarantee the nomination. This has turned the conventions into little more than three-day-long TV ads for the candidates since the actual tallying of votes is just a formality. The last time there was a convention fight to win the majority of delegates’ support was in 1976. That year President Gerald Ford narrowly beat Ronald Reagan to win the Republican nomination.

Why have Iowa and New Hampshire traditionally been so important?

Ivan Apfel/Getty Images

Vivek Ramaswamy
Entrepreneur

Since 1952, New Hampshire has held the first presidential primary in the nation. During the 1970s, the Iowa caucuses, which take place earlier, began to gain importance, especially as a potential springboard for upstart candidates.

In recent years, other states have threatened to move their votes ahead of Iowa’s and New Hampshire’s, arguing that those states—which are small, rural, and less diverse than the country as a whole—shouldn’t wield so much influence over the process of choosing the president.

With that rationale in mind, the Democratic Party has this year chosen South Carolina, which has a significant Black population, to hold the first primary. (To complicate matters, New Hampshire has a state law saying it must hold the nation’s first primary, so it intends to ignore the order set by party leaders.) The Democrats are also moving Michigan, which is a key swing state, earlier in the primary calendar.

Being early in the voting lineup gives a state influence on the process—and a big dose of attention and influx of money.

Since 1952, New Hampshire has held the first presidential primary in the nation. During the 1970s, the Iowa caucuses, which take place earlier, began to gain importance, especially as a potential springboard for upstart candidates.

In recent years, other states have threatened to move their votes ahead of Iowa’s and New Hampshire’s. They argue that small, rural, and less diverse states shouldn’t have so much influence over the process. This year the Democratic Party has chosen South Carolina, which has a significant Black population, to hold the first primary. To complicate matters, New Hampshire has a state law saying it must hold the nation’s first primary. Therefore, it intends to ignore the order set by party leaders. The Democrats are also moving Michigan, which is a key swing state, earlier in the primary calendar.

Being early in the voting lineup gives a state influence on the process. It also comes with a big dose of attention and influx of money.

Courtesy of the White House Historical Association

1980
Ronald Reagan
wins New Hampshire, ending doubts about his candidacy.

1980
Ronald Reagan
 wins New Hampshire, ending doubts about his candidacy.

Courtesy of the White House Historical Association

1988
After a poor showing in Iowa, George H.W. Bush sweeps the South, including Texas, and becomes the front-runner.

1988
After a poor showing in Iowa, George H.W. Bush sweeps the South, including Texas, and becomes the front-runner.

Official White House Photo by Pete Souza

2008
Barack Obama
handily wins the Iowa caucuses, defeating Democratic front-runner Hillary Clinton.

2008
Barack Obama
 handily wins the Iowa caucuses, defeating Democratic front-runner Hillary Clinton.

Library of Congress

2020
Joe Biden
’s big win in South Carolina rescues his struggling campaign. For 2024, Democrats moved South Carolina’s primary date earlier to give the state more influence.

2020
Joe Biden
’s big win in South Carolina rescues his struggling campaign. For 2024, Democrats moved South Carolina’s primary date earlier to give the state more influence.

Key Dates

March 5
Super Tuesday

Voters in 16 states cast ballots.

March 5
Super Tuesday

Voters in 16 states cast ballots.

July 15-18
Republican National Convention

Milwaukee, Wisconsin

July 15-18
Republican National Convention

Milwaukee, Wisconsin

August 19-22
Democratic National Convention

Chicago, Illinois

August 19-22
Democratic National Convention

Chicago, Illinois

November 5
Election Day

November 5
Election Day

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