Labor unions recruited Graham Platner for his U.S. Senate bid, and quickly backed the Democrat when he launched his campaign last August. Senate Minority Leader Chuck Schumer and other national Democrats made similar moves to get Gov. Janet Mills in the race by October. So it is not too surprising that leaders from the influential United Auto Workers and International Brotherhood of Electrical Workers have contacted Schumer and his party’s Senate campaign arm to tell them to stop backing Mills over Platner ahead of the primary that will decide who faces U.S. Sen. Susan Collins, R-Maine, in November. The more...