Janet Mills, D-Maine, on Wednesday declined to endorse Democratic Senate candidate Troy Jackson, but reiterated her belief that Sen. Susan Collins, R-Maine, should be voted out of office. Mills faced off against Graham Platner in the Democratic primary, but lost decisively. Platner later withdrew in the face of scandal and the state party backed Jackson, the former state Senate president, to replace him. “We haven’t spoken, but clearly Susan Collins is vulnerable, and she should be — she should be defeated,” she told local outlet WMTV News 8. Collins has consistently won reelection in the blue-leaning state, even in years that have favored Democrats.