Lansing, Michigan - Democrats vote Tuesday in their marquee primary in Michigan, choosing between a left-wing insurgent and an establishment-backed congresswoman in a contest that has become a proxy war over Israel, electability, and the future of the national party.
The winner will face former Republican Congressman Mike Rogers in November for the seat being vacated by retiring Democratic Senator Gary Peters, a race central to the party's difficult effort to win control of the Senate.
Democrats must defend Michigan while gaining four Republican-held seats to control the upper chamber, making the primary more than an ideological exercise in a state that has swung between the two parties in recent national elections.
Analysts say the results will show whether a current leftist surge among Democrats can move beyond party safe seats and win in battlegrounds with national consequences – or whether Michigan's Democratic establishment can still hold the line.
Abdul El-Sayed, a former Wayne County health director backed by leftist leaders Bernie Sanders and Alexandria Ocasio-Cortez, has cast himself as a working-class fighter willing to confront corporations, party leaders and increasingly unpopular pro-Israel donors.
Haley Stevens, a four-term lawmaker from the Detroit suburbs, has built her campaign around experience, manufacturing and electability. She is supported by establishment figures from Senate Democratic leader Chuck Schumer to Michigan Governor Gretchen Whitmer.
Several recent polls have shown El-Sayed ahead, raising the prospect of the left's biggest victory yet in a primary season marked by a series of anti-establishment wins.
Can El-Sayed's momentum lead him to the Senate?
His allies say the campaign's volunteer energy proves progressives can build a statewide coalition without relying on Washington's traditional donor network.
"Momentum doesn't happen by accident," said Joseph Geevarghese, executive director of the grassroots group Our Revolution, which says its volunteers have made more than 300,000 voter contacts for El-Sayed.
Stevens is counting on support that she says may be underrepresented in opinion polls – from Black voters, older Democrats and people without college degrees.
The bitterest divide has been over the US' deep support for Israel.
Stevens has defended continued military backing for the country and rejected accusations that Israel committed genocide in Gaza.
El-Sayed has called for an end to unconditional US aid, attacked the influence of the American Israel Public Affairs Committee lobby group, and said Israel should not exist specifically as a Jewish state.
AIPAC spending and outside advertising totaling $90 million – in a state with a large Arab American population and deep anger over Israel's assault on Gaza – has made Michigan another national test of the pro-Israel lobby's ability to shape Democratic primaries.
The candidates have traded increasingly personal attacks, with El-Sayed calling Stevens "the least capable candidate in America," while she has accused him of blaming his problems on Jewish Americans.
Congresswoman Debbie Dingell, who has remained neutral, warned that the "brutality" and "ugliness" of the campaign could make it harder for Democrats to unite afterward.
Both camps insist their candidate offers the stronger path against Rogers.
Anti-establishment push propels Democratic nominees
Stevens points to Michigan's tradition of electing pragmatic Democrats, while El-Sayed argues that a candidate powered by grassroots enthusiasm is more likely to turn out working-class and younger Democrats.
Michigan voted narrowly for President Donald Trump in 2024, even as Democrat Elissa Slotkin edged Rogers in that year's Senate race, underscoring both the state's competitiveness and the risks of a divided party.
The ideological struggle extends down the ballot.
In Detroit's safely Democratic 13th district, Congressman Shri Thanedar is fighting for survival against state lawmaker Donavan McKinney, who is backed by Sanders, Justice Democrats, and several members of the Congressional Black Caucus.
Thanedar benefited in previous elections from multiple Black candidates dividing the vote.
This time, progressive and Black political organizations have largely united behind McKinney in a historically Black district, making the incumbent vulnerable to the anti-establishment mood sweeping Democratic primaries.