US PoliticsMaine Gov. Janet Mills to Challenge Susan Collins for Senate in 2026The governor will challenge the incumbent Sen. Susan Collins (R-Maine) in the only state where the GOP must defend a seat Trump lost in 2024. SaveMark Us Preferred on GooglePrintGov. Janet Mills delivers her State of the State address in Augusta, Maine, on Jan. 30, 2024. Robert F. Bukaty/AP PhotoChase Smith10/14/2025|Updated: 10/14/20250:00X 1Maine Gov. Janet Mills, a Democrat, on Oct. 14 officially launched a U.S. Senate bid against Republican Susan Collins in next November’s elections.Mills’s campaign had briefly posted, then deleted, a fundraising video and an ActBlue donation page on Oct. 10.We had a problem loading this article. Please enable javascript or use a different browser. If the issue persists, please visit our help center.