Super Tuesday primaries 2024: Trump and Biden dominate, Haley drops out

538 tracked how Trump and Haley did, plus key U.S. House and Senate races.

March 5 was Super Tuesday — the biggest election day of the year until the one in November! With former President Donald Trump projected to win 14 of the day's 15 GOP presidential nominating contests, former U.N. Ambassador Nikki Haley announced Wednesday morning that she is suspending her campaign.

It was also the first downballot primary day of 2024, with important contests for Senate, House and governor in states like Alabama, California, North Carolina and Texas.

538 reporters, analysts and contributors broke down the election results as they came in with live updates, analysis and commentary. Read our full live blog below.


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ABC News projects Biden and Trump will win in Arkansas

Based on an analysis of the vote, ABC News projects that Trump and Biden will win their presidential primaries in Arkansas. With about 7 percent of the expected vote in, Womack is holding onto his lead in the 3rd Congressional District 60 percent to 40 percent against Penzo.

—Monica Potts, 538


Answer: Democrats!

I'll be very interested to see, when the dust settles tonight, if the polls are more on the money in states with closed primaries, where bored (or wily) Democrats can't vote in the Republican Party primary for Haley. A lot of the exit polling data we've seen on Haley supporters and who they'll vote for in the general election, or whether they approve of Biden's job performance, makes me wonder how many of her voters are just plain old Democrats who are getting screened out of a lot of GOP primary polling. But we'd see a difference in closed primary states (to the extent we have robust polling there to make the comparison)!

—Jacob Rubashkin, Inside Elections


Answer: Polls might be struggling to pick up some more Democratic-leaning voters

Julia, I'm suspicious that the reason Trump's lead in primary polling has been somewhat exaggerated is that pollsters are not necessarily capturing some of the independents who are showing up to vote in a GOP primary. As Nate Cohn recently pointed out in The New York Times, some pollsters have filtered for likely GOP primary voters by mostly or only looking at voters who've voted in Republican primaries. But a fair number of independents, including Democratic-leaning ones, wouldn't necessarily fall in that category. But with Biden a lock to win the Democratic nomination — barring something happening outside of the voting booth — Democratic-leaning voters have only one race to get involved in. Although we know there aren't that many "cross-over" voters who participate in the opposing party's primary, some high-propensity Democratic voters and some Democratic-leaning independents have probably voted in states that allow non-Republicans to cast ballots in the GOP primary.

—Geoffrey Skelley, 538


Answer: The 'silent voters' aren't so silent, anymore

In 2016, people who said they were undecided in polls were more likely to vote for Trump as "professor polls" explains in this great 538 video I show my students. But in 2024, Trump supporters aren't so shy. It's the rest of the GOP that might be more bashful.

—Meredith Conroy, 538 contributor


Final thought: Congress is the most interesting fight now

The presidential primaries are, for all intents and purposes, over. That means we can finally shift our focus to the primaries that are going to have the most impact on the outcome in November, in the House and Senate. Tonight we saw the first of those contests, and they did not disappoint. In Alabama, an appropriator, Rep. Jerry Carl, lost to a firebrand colleague, Barry Moore, in a member versus member primary. (Let's see what that does to morale in the GOP conference.) In California, Adam Schiff successfully engineered an uncompetitive general election against Republican Steve Garvey, freeing up tens of millions in small donor dollars for races elsewhere around the country. In North Carolina, a bevy of upcoming runoffs will help determine what shape the next House GOP conference takes. And in Texas, we're going to find out in the 23rd District just how much deviation from party orthodoxy is tolerated, when Tony Gonzales faces the music for his votes on a gun bill (negotiated by the state's own senior GOP senator!). Presidential season may be over, but the fun is just beginning.

—Jacob Rubashkin, Inside Elections