In North Carolina, Nida Allam, the Sanders-backed candidate, lost to Valerie Foushee, a state legislator, in an open congressional race. Ms. Foushee’s campaign was supported by nearly $3.5 million in spending from two pro-Israel groups and a super PAC linked to a cryptocurrency billionaire. Super PAC spending for Ms. Allam was $370,000.
Maya Handa, Ms. Allam’s campaign manager, said Mr. Sanders’s megaphone — he did robocalls, sent a fund-raising email to his giant list and held a virtual event — brought invaluable attention to the outside money flooding in the race.
The message broke through to some voters. In Hillsborough, Elese Stutts, 44, a bookseller, had been planning to vote for Ms. Foushee. However, on Election Day, Ms. Stutts said, she was turned off after learning about the origin of the super PAC money that had helped Ms. Foushee’s campaign.
Ms. Foushee ultimately won the Democratic primary for a district that includes several major universities, including Duke and the University of North Carolina at Chapel Hill, and where Mr. Sanders registered 83 percent favorability among Democratic primary voters in the Allam campaign’s polling.
Mr. Sanders has sparred with pro-Israel groups over the years, including during his 2020 presidential run, when a group called the Democratic Majority for Israel PAC spent money to attack him when he emerged as a front-runner early in the primary season.
And when one of Mr. Sanders’s national co-chairs, Nina Turner, ran for Congress in a special election in 2021 and again in 2022, that group and the AIPAC-aligned super PAC both spent heavily to defeat her.
Understand the 2022 Midterm Elections
Why are these midterms so important? This year’s races could tip the balance of power in Congress to Republicans, hobbling President Biden’s agenda for the second half of his term. They will also test former President Donald J. Trump’s role as a G.O.P. kingmaker. Here’s what to know:
What are the midterm elections? Midterms take place two years after a presidential election, at the midpoint of a presidential term — hence the name. This year, a lot of seats are up for grabs, including all 435 House seats, 35 of the 100 Senate seats and 36 of 50 governorships.
What do the midterms mean for Biden? With slim majorities in Congress, Democrats have struggled to pass Mr. Biden’s agenda. Republican control of the House or Senate would make the president’s legislative goals a near-impossibility.
What are the races to watch? Only a handful of seats will determine if Democrats maintain control of the House over Republicans, and a single state could shift power in the 50-50 Senate. Here are 10 races to watch in the House and Senate, as well as several key governor’s contests.
When are the key races taking place? The primary gauntlet is already underway. Closely watched races in Pennsylvania, North Carolina and Georgia will be held in May, with more taking place through the summer. Primaries run until September before the general election on Nov. 8.
Go deeper. What is redistricting and how does it affect the midterm elections? How does polling work? How do you register to vote? We’ve got more answers to your pressing midterm questions here.
“I understand Senator Sanders’s grudge against us,” said Mark Mellman, the president of Democratic Majority for Israel PAC. “We helped prevent him from winning Iowa and the presidential nomination. Then we helped stop his campaign chair from winning a House race in Cleveland. Honestly, I wouldn’t be happy with us either, if I were him.”
