The Cook Political Report categorized every Senate seat up in 2026 — here’s how they ranked the 7 most competitive races:

We’re casting the widest net possible to maximize our chances for a Blue Senate. Every dollar invested in our Candidate Fund over the next 18 months will DIRECTLY boost Democratic candidates in these 7 races.
Help us ensure that our eventual Democratic nominees can run aggressive and effective campaigns to take back the U.S. Senate. Invest $5, $10, or any amount that you’re able to today.
— Blue Senate Candidate Fund
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