Jon Tester Campaign Manager. Blackstone employees have also contributed $28,519 to. Then, he pledged that republicans would defeat senator jon tester, the democratic incumbent, in november, as well as kamala harris.

Jon tester announced wednesday that he will run for reelection, a major boost to senate democrats defending their majority on a tough map in 2024. Jon tester’s reelection bid with the newly formed group republicans for tester,.