The Montana Senate race between incumbent Democrat Sen. Jon Tester and Republican challenger Tim Sheehy is increasingly viewed as favoring the GOP. The Cook Political Report has shifted its rating from 'toss-up' to 'lean Republican,' reflecting recent polls that show Sheehy with a consistent, albeit narrow, lead over Tester. This change is significant as it boosts Republican hopes of flipping the Senate, especially with another seat likely to change in West Virginia due to Sen. Joe Manchin's retirement. Tester, a three-term incumbent, faces a tough reelection battle in a state that has trended more conservative in recent years. Both parties recognize this race as critical for control of the upper chamber, with Tester emphasizing his local ties and Sheehy positioning himself as aligned with national GOP priorities. The outcome of this race could be a determining factor in whether Republicans regain control of the Senate.