Sen. Jon Tester (D-MT) is undoubtedly a top-tier 2024 target for defeat by Republicans. But political baggage attached to the two most likely GOP Senate nominees has some Republican political professionals concerned.

On Feb. 22, Tester said he is running for reelection next year. Coming from a red state, Tester is considered among the three most vulnerable Democratic Senate incumbents, along with Sens. Sherrod Brown in Ohio and Joe Manchin in West Virginia. Tester, Brown, and Manchin top Republican target lists in the party’s quest to overturn the current 51-49 Senate Democratic majority.