Retiring U.S. Sen. Gary Peters (D-Mich.) backs Democratic Rep. Haley Stevens to replace him ahead of the Michigan Senate primary next month, according to multiple outlets. Peters had previously taken a neutral position in the race for his open seat, but he reverses that stance and publicly endorses Stevens. The decision comes as some party leaders work to steer the nomination away from progressive candidate Abdul El-Sayed. The reporting describes the primary as contentious and frames Peters’ endorsement as an effort to consolidate support behind Stevens within the Michigan Democratic field. Peters’ endorsement is presented as a key development because it adds the influence of an incumbent senator—now retiring—to Stevens’ campaign. Across sources, the focus is on Peters’ shift from neutrality to active support, and on the context of intraparty competition as Democratic activists and leaders seek to shape who wins the nomination. None of the provided summaries indicate Peters endorses any other candidates.