Blum's in a lot of trouble. He's a very weak incumbent, 2018 will more likely than not be a Democratic wave year, and (most importantly) he probably won't be facing an absolutely awful opponent this time around (the only reason he did so well in 2016 was that Vernon turned out [unexpectedly IIRC] to be a very weak candidate who ran an extremely lazy campaign)
From the posts I read I would've assumed he won by better than 60-40. Imagine my surprise when this "strong incumbent" got only 53% of the vote.
Yeah, he's a top Democratic target.