class=”for-attr”>This story was originally published in the Forward. Click here to get the Forward’s free email newsletters delivered to your inbox.

Tuesday’s primary contest for an open U.S. Senate seat in Michigan has become a proxy fight over the Gaza war and a referendum on Israel supporters’ influence in Democratic politics. Democratic voters will decide whether to nominate Dr. Abdul El-Sayed, who is leading in the polls after assailing his opponent as beholden to the campaign fundraising group AIPAC, or Rep. Haley Stevens, a reliable supporter of Israel who has condemned what she called “inflammatory rhetoric” from El-Sayed.

Following a string of primary victories by insurgent Democrats who made condemning Israel central to their campaigns — from New York to New Jersey, Pennsylvania and Colorado — the outcome will become the clearest test yet of whether the vocally anti-Israel progressive movement may come to define the Democratic Party.

Recent polls show El-Sayed with growing momentum, leading Stevens by as much as 16 points.

Michigan, home to one of the country’s largest Arab-American communities, was already a national hot spot for voter pushback on pro-Israel politics as the birthplace of the 2024 “uncommitted” movement that protested President Joe Biden’s support for Israel’s war in Gaza by submitting blank ballots in the presidential primary.

It also has an influential Jewish community that has become deeply invested in the race — and with some El-Sayed supporters among them.

Tuesday’s winner will have to prevail in the November general election, and success is not guaranteed: While Democrats are a majority of registered voters in Michigan, Republican President Donald Trump won the state in 2016 and 2024.

With Democrats counting on winning Michigan as they aim to retake the Senate, the questions looming over Tuesday’s primary aren’t just about the party’s direction on Israel — they’re also about whether running against Israel is a winning message in a swing state.

Democrats are facing a difficult path to winning Senate control even as polls show growing dissatisfaction with the Republican agenda.

A look at three possible scenarios shows the high stakes of the race for the Democratic Party and the place of Israel in U.S. politics:

An El-Sayed victory

An Emerson College survey of 700 voters shows El-Sayed leading Stevens by 16 points, despite more than $60 million of outside spending attacking him. AIPAC’s super PAC, United Democracy Project, has spent $30.6 million backing Stevens, according to recent FEC filings. AIPAC also raised several million dollars for Stevens by directing its donors to online portals that funnel money directly to the candidate’s campaign. All in all, the Michigan contest is AIPAC’s largest investment this election cycle.

If El-Sayed wins, he would become the first Muslim nominated by a major party for the U.S. Senate and would immediately become one of the most prominent figures on the Democratic left. It would echo the victory of Zohran Mamdani in last year’s mayoral race as the city’s first Muslim mayor and the most prominent democratic socialist in office, with Jews divided between fierce opposition and fiery support.

But the immediate political meaning would be about AIPAC.

The progressive frontrunner has transformed AIPAC’s investment in the race into a centerpiece of his campaign message. Backed by Sen. Bernie Sanders of Vermont, El-Sayed used AIPAC as a political foil and a symbol of everything he says is wrong with Democratic politics: super PAC money, billionaire influence and demands for unconditional support for Israel. A poll of Michigan voters conducted by Data for Progress in April found that 64% of likely Democratic primary voters would be less inclined to support a candidate backed by AIPAC.

At a recent virtual town hall hosted by Progressive Democrats of America, El-Sayed compared his possible victory to David defeating Goliath. “AIPAC, if you’re listening, burn your money, come back and burn it again in the general,” he said. “I’m happy to burn your money for you, and then we can get onto the business of governing and asking whether or not our foreign policy ought to be dictated to us by the interests of a foreign government.”

An El-Sayed win would mark a reversal from AIPAC’s last confrontation with Stevens’ opponents in Michigan. In 2022, Stevens defeated Jewish Rep. Andy Levin by 20 points in a rare incumbent-versus-incumbent House primary after redistricting. Levin argued that the group was trying to punish him for criticizing Israeli policy and supporting Palestinian rights. AIPAC celebrated Levin’s defeat as proof that even a Jewish incumbent could not survive after crossing the organization. (Levin is supporting El-Sayed.)

It would also create immediate questions about how El-Sayed would operate in Washington.

Would he support Sen. Chuck Schumer, the highest-ranking Jewish elected official in American history and one of Stevens’ most powerful allies, as Democratic leader if Democrats win the majority? And would he give Senate progressives new leverage over key votes on Israel?

What if El-Sayed loses the general election?

For Democrats worried about electability, the primary is only the first test.

The winner will face former Republican Rep. Mike Rogers, who narrowly lost Michigan’s 2024 Senate election and is now running with a largely unified Republican Party behind him.

Michigan remains one of the country’s key battlegrounds. President Donald Trump carried it in 2016, lost it in 2020 and won it again in 2024. Sen. Elissa Slotkin,  a moderate Democrat who was an intelligence analyst in the CIA and served three tours in Iraq, won her race even as Trump carried the state.

Recent polls found Rogers leading El-Sayed by single digits.

Some Michigan Jewish Democrats are already considering whether they could support El-Sayed, vote for the Republican, or leave their ballot blank in November. Jewish voters make up just 1.4% of the electorate in the state.

Stevens has sharpened those concerns in the final days of the campaign. She accused El-Sayed of blaming “all of your problems on Jewish Americans,” warning that his rhetoric would lead to defeat in the face-off with Rogers. El-Sayed, who has courted Jewish voters without moderating his views on Israel, rejected accusations of antisemitism.

“I love and revere Judaism and the Jewish people,” he said.

A November loss would have consequences far beyond Michigan.

Democrats are already facing an uphill battle for Senate control after the collapse of Graham Platner in the competitive Maine Senate race.

Losing the seat being vacated by Sen. Gary Peters would further divide Democrats. Party leaders would almost certainly blame El-Sayed’s ideology, his vocal opposition to Israel and the progressive groups that elevated him for losing a swing state. AIPAC, meanwhile, would claim vindication despite losing the primary.

Speaking with reporters on Sunday, El-Sayed said he’s confident Democratic voters will rally behind his candidacy as they reckon with what is at stake.

What if Stevens survives? 

A Stevens victory would offer a very different lesson.

It would show that experience, establishment support and a strong general-election argument can still overcome anger about AIPAC, even in the state where the uncommitted movement began. Even a narrow victory would preserve AIPAC’s reputation as one of the most effective forces in Democratic primaries.

But it would say more about Stevens and her personality. She first entered Congress in the 2018 Democratic wave, capturing a Republican-held suburban district. She then survived redistricting and defeated Levin in the bruising 2022 primary.

Stevens has the backing of Gov. Gretchen Whitmer, Schumer and much of Michigan’s Democratic establishment. And she leads Rogers in a November matchup.

By Wednesday morning, Democrats will know who won Michigan. It may take until November or even longer to know whether Tuesday’s vote marked the beginning of a new era in Democratic politics or another chapter in the party’s divide over Israel. Nonetheless, Democratic leaders still have to reunite a coalition fractured over Gaza and manage a growing progressive wing in the House.

The fight extends down the ballot

The Senate contest is not the only Michigan race testing the strength of the progressive left.

In Detroit’s 13th Congressional District, state Rep. Donavan McKinney, a member of the Democratic Socialists of America, is challenging incumbent Rep. Shri Thanedar with the support of Justice Democrats. The group, which helped launch Alexandria Ocasio-Cortez and other members of the Squad, made McKinney its first congressional endorsement in four years.

In Michigan’s 7th District, former climate activist William Lawrence is running against two centrist Democrats in the primary, making an end to all U.S. military aid to Israel a key part of his campaign. The seat was previously held by Slotkin.

On a state level, Abbas Alawieh, one of the leaders of the uncommitted movement in Michigan, is running for a seat in the state legislature in a Dearborn-area district with a large Arab and Muslim population. In a sign of his growing profile, Alawieh recently met with former Vice President Kamala Harris.

AIPAC and the debate over Israel is also spilling into a neighboring state Senate race. Pro-Israel donors are spending heavily to back Justin Onwenu against former State Rep. Abraham Aiyash, an outspoken critic of Israel’s war in Gaza.

It has also reached the University of Michigan’s Board of Regents. Michigan Democrats nominated Amir Makled, an attorney who represented pro-Palestinian protesters, after he defeated incumbent Regent Jordan Acker at the party convention. Makled faces scrutiny for past Hezbollah praise and antisemitic posts. Republican regent candidates Lena Epstein and Michael Schostak, both Jewish, have campaigned on antisemitism and campus safety. That race will be decided in November.

This story was originally published on the Forward.