The move leaves Todd Achilles, a former Democratic state legislator and an Army veteran, as the main challenger to Republican Sen. Jim Risch. Democrats have long struggled in Idaho, one of the nation’s most Republican states. Last week, Democratic Senate nominee Cindy Burbank withdrew from the Senate race in a boost to Osborn. Resisting pressureBut efforts to get Democratic Senate nominees to drop out in other red-leaning states have been less successful. Bengs, a Navy and Air Force veteran, was the Democratic nominee against Senate Republican leader John Thune in 2022.