A vulnerable Democrat senator facing a tough re-election has refused to endorse Kamala Harris for president and won’t be attending the Democratic National Convention this week.
Sen. Jon Tester (D‑MT), appears to have fallen behind his opponent, Republican challenger Tim Sheehy, in the latest polls, and the senator’s refusal to endorse Harris or attend the DNC appear to be calculated moves to try and save his seat.
In the three most recent polls, conducted between June 29 and August 12, Sheehy …