Abdul El-Sayed (D) defeated Haley Stevens (D) in the Democratic primary for U.S. Senate in Michigan on August 4, 2026.

Two-term incumbent Gary Peters (D) did not run for re-election. Peters endorsed Stevens on July 13, 2026. Crain's Detroit Business' David Eggert said the primary was "Michigan’s first truly competitive Democratic Senate primary in 32 years."

El-Sayed was, as of the 2026 election, a public health administrator who ran for governor in 2018. El-Sayed completed Ballotpedia's Candidate Connection survey. In his survey response, El-Sayed wrote, "I didn't set out to be a politician; I trained as a doctor, but saw how broken politics were making people sick. Our healthcare system itself is part of the problem. We need Medicare for All." U.S. Sen. Bernie Sanders (I-Vt.) endorsed El-Sayed.

Stevens was elected to the U.S. House in 2018. She previously worked in the private sector and as chief of staff to the U.S. Auto Rescue Task Force during President Barack Obama's (D) administration. Stevens' campaign website said, "Haley is running for Senate to continue to fight for Michiganders and our economy while standing up to the Trump-Musk chaos agenda. When elected, she will fight to lower costs, protect the benefits that Michiganders paid into and earned over a lifetime of work, and defend our personal freedoms." U.S. Sen. Chuck Schumer (D-N.Y.) endorsed Stevens.

A third candidate, Mallory McMorrow (D), suspended her campaign on July 5, 2026. McMorrow still appeared on the ballot.

As of July 2026, major election forecasters rated the general election Toss-up or Lean Democratic. The last Republican to win an election for U.S. Senate in Michigan was Spencer Abraham in 1994. In 2024, Donald Trump (R) defeated Kamala Harris (D) 49.7%–48.3% in the presidential election in Michigan, and Elissa Slotkin (D) defeated Mike Rogers (R) 48.6%–48.3% in the senatorial election.