Democrats' 22-person race in Maryland's 3rd District came down to two candidates (as expected). With 55 percent of the expected vote reporting, ABC News reports that Elfreth is the projected winner, and she leads Dunn 36 percent to 25 percent.

Question for the group: Is anyone surprised by Elfreth's win? I am a bit surprised, given Dunn's celebrity status.

—Meredith Conroy, 538 contributor

We've been tracking how people of color are performing in primaries throughout this cycle, and there were 47 on the ballot tonight, 44 of whom were running in Maryland. Overall, seven are projected to win, of which Alsobrooks is probably the most notable.

Alsobrooks could make history as the third Black woman to ever win election to the Senate, though she could share that honor with Rep. Lisa Blunt Rochester, who is favored to win Delaware's open Senate seat. Elsewhere in Maryland, two Black Democratic incumbents, Ivey and Mfume, also won renomination. Klacik, whom Meredith discussed, won the GOP nomination in Maryland's 2nd District, but will be a huge underdog in November. It's a similar story for Talkington in Maryland's 5th District. In Nebraska, meanwhile, Vargas was unopposed for the Democratic nomination and will face Bacon in the state's purple 2nd District this November. And in one of Nebraska's Senate races, Love Jr. was unopposed and will very likely lose against Ricketts in the solidly red state. Beyond those individuals, it's unlikely that any other candidates on the list will win a primary tonight.

—Geoffrey Skelley, 538

At Angela Alsobrooks's HQ in Greenbelt, excitement is getting more and more tangible — with results of her victory now called, the crowd is listening to some of her high-profile supporters in anticipation of her own appearance on stage.

Alsobrooks — who had a significant funding disadvantage compared to her much wealthier opponent — seems to have captured the majority of primary votes based on her slate of important endorsements from people, including Gov. Wes Moore and Reps. Steny Hoyer and Jamie Raskin.

"What do they say? Money can't buy you love," Maryland Lt. Gov. Aruna Miller said at Alsobrooks's election night party on Tuesday.

"I am so very proud of Angela Alsobrooks," Hoyer echoed, saying "both" Trone and Alsobrooks would have beaten Larry Hogan in a general election, but "Angela was the strongest candidate."

—Isabella Murray, ABC News

ABC News reports that April McClain Delaney is projected to win the Democratic primary in Maryland's 6th District, and that Neil Parrott is projected to win the Republican primary there. Both currently hold double-digit victories over their closest opponents, with over 55 percent of the expected vote reporting in each race. Delaney will start out as the favorite in the general election, but this is a district that could conceivably become competitive in a bad year for Democrats.

—Jacob Rubashkin, Inside Elections

It's going to be a minute before we start to get primary results this evening, so allow me to make a humble suggestion in the meantime: Listen to the 538 Politics podcast!

Yesterday I sat down with my colleagues Nathaniel and Geoffrey and friend of the pod Leah Askarinam to talk about the recent The New York Times/Siena College swing-state polls and preview tonight's races. In case you missed it, the polling was pretty bad for President Joe Biden. He trailed former President Donald Trump in every battleground state except Wisconsin and lagged by 12 percentage points in Nevada.

But there are some caveats in understanding what those polls mean at this point in the cycle. Most importantly, it's less that Trump has picked up ground than that Biden has lost it, and a big question over the next five and a half months will be whether Biden can gain that support back. There's a lot more to say, but I'll let you listen to find out!

As far as tonight's races go, we mainly focused on the important Democratic Senate primary in Maryland, where things are looking truly competitive. We also hit on a couple of House primaries that feature people who were in the Capitol on Jan. 6, 2021 — one Capitol police officer and one Trump supporter. Check it out!

—Galen Druke, 538