The Memo: Angie Nixon’s shock Florida win gives fresh boost — and a new test — for the left

The left of the Democratic Party scored its biggest upset of the year on Tuesday — and it did so in Florida, a state that is usually inhospitable territory for anything adjacent to socialism. State Rep. Angie Nixon (D) beat Alexander Vindman handily in the Democrats’ U.S. Senate primary.  Nixon, a progressive lawmaker and organizer…