Graham Platner, the Maine Democratic Senate candidate backed by Sen. Bernie Sanders (I-Vt.), wrote in 2020 that he had an "antifa supersoldier" label on his "armor," according to an archived post reviewed by Axios. Why it matters: Progressives have elevated Platner as one of their top candidates in next year's midterm elections, but his old Reddit posts have thrown his campaign into turmoil. Platner is running to unseat Sen. Susan Collins, Senate Democrats' top Republican target next year. The contest for the Democratic nomination between Platner and Maine Gov. Janet Mills — who's preferred by Democratic Party leaders — already...