Mills enters Maine Senate race, teeing up Democratic proxy battle

Maine Gov. Janet Mills (D) connected Tuesday formally launched her bid to unseat Sen. Susan Collins (R-Maine), teeing up the latest high-profile superior to pit constitution and populist factions of the Democratic Party against each other. Mills launched her run aft overmuch prodding from Senate Minority Leader Chuck Schumer (D-N.Y.). But salient progressives similar Sen.…