A couple weeks ago I thought he'd sleepwalk to a 55-44 victory, but he came out in support of the immigration ban, and the anti-Trump fervor in the beltway area is very strong.
He's still moderately popular, but if Democrats are serious about it they can win it back. The question is if it's worth it over trying to snatch open seats in Michigan, Nevada, Florida, etc. or trying to oust Scott Walker. I think he's still favored to get reelected just because Dems have so many other races to focus on.
Coming out in favor of an immigration ban in a wealthy liberal state...what was he thinking? I could understand it in say, Rhode Island or Maine, but that seems tremendously idiotic given the environment he will run in.