“Sen. Jon Tester’s (D-MT) reelection was already difficult. It just got a little harder,” Politico reports. “The Montana state Supreme Court upheld a lower court ruling Tuesday that Green Party candidate Robert Barb can remain on the ballot for this fall’s Senate race, a blow to state Democrats who had fervently tried to block him out of fear he would pull votes away from the highly vulnerable Tester.” Politico: Control of the Senate is coming down to Montana — and Democrats are struggling.