Plus of course there's the liberal bias against a white male.
Low turn out for a primary is hardly anything new. Last I saw, she was ahead by about 4100 votes, which will likely squeeze down a bit more when more absentee ballots are counted with a little bounce from provisional ballots. My own rat lizard of a congressman pulled down over twice the amount of votes of both of the candidates in this story to put it in more perspective. In theory both primaries should have an equal number of voters but looking historically, non-presidential years seem to be around this range.
He went the road of Hillary Clinton; self assured that he'd handily win the election, didn't bother to campaign, didn't push a GOTV effort, got fired by the people he represents. Now he'll enjoy his congressional retirement and probably think about picking up a senatorial bonus to further feather his nest.
Its awfully soon for them to be forgetting the lesson of Hillary and complacency, I hope they keep it up.