Nick Zaharias of Derry, N.H., a public witness, loads a test ballot into a vote counting machine while testing machines before the New Hampshire primary, at the Derry Municipal Center, Tuesday, Jan. 16, 2024. (AP Photo / Charles Krupa)

With Ron DeSantis ending his 2024 campaign and endorsing Donald Trump on Sunday, the Tuesday primary becomes the first one-on-one matchup between Trump and Nikki Haley.

Republican presidential candidate former President Donald Trump takes the stage at a caucus night party in Des Moines, Iowa, Monday, Jan. 15, 2024. (AP Photo / Andrew Harnik)

About 7 in 10 Iowans who caucused for Donald Trump on Monday night said they have known all along that they would support a man who has remade the Republican Party through his “Make America Great Again” political movement. 

Republican presidential candidate and Florida Gov. Ron DeSantis and his wife Casey, walk in the July 4th parade, July 4, 2023, in Merrimack, N.H. (AP Photo / Reba Saldanha, File)

As the six-month sprint to the Iowa caucuses begins, the sprawling field of Republican presidential candidates is facing growing pressure to prove they can become serious challengers to former President Donald Trump.

Moms for Liberty members, from left, Cheryl Bryant, Mishelle Minella, Kelly Shilson and Jessica Tillmann pose for a portrait at Reiter Park on Thursday, Nov. 18, 2021, in Longwood, Fla. (Chasity Maynard / Orlando Sentinel via AP, File)

Moms for Liberty didn’t exist during the last presidential campaign, but the Florida-based nonprofit that champions “parental rights” in education has rapidly become a major player for 2024, boosted in part by GOP operatives, politicians and donors.

People wait in line to early vote for the U.S. Senate runoff election in Georgia between Sen. Raphael Warnock and challenger Herschel Walker, on Nov. 28, 2022, in Kennesaw, Ga., near Atlanta. (AP Photo / Mike Stewart, File)

Republicans are poised to launch aggressive get-out-the-vote campaigns for 2024 that employ just those strategies, attempting to match the emphasis on early voting Democrats have used for years to lock in many of their supporters well ahead of Election Day.

Protesters stand outside of the Senate chamber at the Indiana Statehouse on Feb. 22, 2023, in Indianapolis. (AP Photo / Darron Cummings, File)

Sounding the alarm about the current political environment, the nation’s largest organization devoted to the rights of lesbian, gay, bisexual, transgender and queer Americans said advisories warning against travel to dangerous places aren’t enough to help people already living in so-called hostile states.

Florida Gov. Ron DeSantis speaks at the Conservative Political Action Conference (CPAC), Feb. 24, 2022, in Orlando, Fla. DeSantis has filed a declaration of candidacy for president, entering the 2024 race as Donald Trump's top GOP rival (AP Photo / John Raoux, File)

The 44-year-old Republican revealed his decision in a Federal Election Commission filing before an online conversation with Twitter CEO Elon Musk.

A pile of challenged books appear at the Utah Pride Center in Salt Lake City on Dec. 16, 2021. (AP Photo / Rick Bowmer, File)
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More than 1,200 challenges were compiled by the association in 2022, nearly double the then-record total from 2021 and by far the most since the American Library Association began keeping data 20 years ago.

Former Vice President Mike Pence, left, speaks to reporters before the MockCon event at University Chapel at Washington and Lee University on Tuesday, March 21, 2023, in Lexington, Va. (Scott P. Yates / The Roanoke Times via AP)

From Florida Gov. Ron DeSantis to former Vice President Mike Pence and South Carolina Sen. Tim Scott, there appears to be little rush to join the field of official presidential candidates. The reluctance reflects the unsettled nature of U.S. politics.

Florida Gov. Ron DeSantis appears at an event for law enforcement officers on Feb. 20, 2023, in Elmhurst. (WTTW News)

The Chicago area was DeSantis’ third stop after visiting New York and Philadelphia, so the tour will certainly be cast as part of his early exploration of a White House run.