It didn't take long for Maine's Austin Theriault to dispatch with his primary tonight. With just 21 percent of the expected vote counted, Theriault leads opponent Michael Soboleski, 67 percent to 33 percent, and the AP projects that Theriault will be the winner in Maine's 2nd District.

—Jacob Rubashkin, Inside Elections

Upstate, the race to replace retiring Rep. Jeff Duncan has essentially fallen into a close three-person race. With 63 percent of the expected votes counted, Trump-endorsed Burns is at 31 percent, Biggs has 30 percent and Jones has 20 percent. Toss in double-digit support for Kevin Bishop, the recently retired communications director for Sen. Lindsey Graham, and it's enough to split the vote in a way that makes it very hard for any candidate to break the majority threshold. Whoever finishes tonight in the top two slots will very likely face off again in a runoff election in two weeks' time. It's been interesting to see the vote regional breakdown as ballots are counted. Jones is leading in Laurens County with 52 percent of the vote there — no surprise, as this is the part of the district that Jones represents in the state House. Burns is leading in Pickens, Abbeville (trivia: this is the first county in the U.S., alphabetically), and McCormick Counties — the first two are slightly more conservative, and the first is his home county.

—Kaleigh Rogers, 538

As we've noted, Mace was one of eight Republicans who voted to oust McCarthy from the speakership last year. Two (Ken Buck and Matt Rosendale) have already resigned or retired from Congress, and McCarthy allies were targeting many of the other six for defeat in primaries this year. Mace was the first of these to face voters, and she obviously survived, so pro-McCarthy forces are 0-for-1.

—Nathaniel Rakich, 538

The AP has projected that Nancy Mace will win the GOP nomination in South Carolina’s 1st District. It’s an early call for the embattled congresswoman who has angered both Trump allies and House GOP leadership over her two terms in Congress. She leads her opponent, 58 percent to 29 percent, with just over a quarter of the vote counted. Mace will be the favorite in the general election too, after the Supreme Court halted a lower court’s ruling that her district needed to be redrawn.

—Jacob Rubashkin, Inside Elections

We're about 20 minutes out from polls closing in Nevada, so let's take a look at some of the key races happening there tonight.

Nevada will hold a pivotal Senate contest this fall for the seat held by Democratic Sen. Jacky Rosen. Retired U.S. Army Capt. Sam Brown is the front-runner in the Republican primary, having established himself by finishing second for the GOP nomination in Nevada's 2022 Senate race. Brown's candidacy is highlighted by his military service record, during which time he suffered third-degree burns from a 2008 roadside bomb explosion in Afghanistan. Brown has proved a prodigious fundraiser, having brought in $7.1 million as of May 22. Former Ambassador to Iceland Jeffrey Ross Gunter, who served under Trump, is Brown's main competition, and he's self-funded $2.7 million of the $3.3 million he's raised.

National Republicans have largely consolidated behind Brown, including the National Republican Senatorial Committee. Brown and the NRSC have run joint ads focused on immigration and national security, and Rosen's campaign is already running spots against him focused on abortion rights. For his part, Gunter has linked himself to Trump, though Trump made a last-minute endorsement of Brown Sunday night, and has run ads claiming Brown backs the controversial-but-stalled plan to store nuclear waste at Yucca Mountain. Brown expressed support for the plan during his 2022 bid, but has backtracked in the face of criticism this time around.

It's unclear how big a threat Gunter is to Brown, as an early June survey from Noble Predictive Insights found Brown ahead 53 percent to 15 percent. But Gunter released a late May survey by Kaplan Strategies that found him running about even with Brown at around 30 percent. Outside groups have come in big for Brown to the tune of $4.3 million, and Gunter is enough of a danger that the pro-Brown Duty First Nevada super PAC is running ads portraying Gunter as a fake Republican. Still, Gunter's campaign actually canceled some ad buys ahead of the primary — not exactly a signal of confidence.

—Geoffrey Skelley, 538