The LA Times blog reports that Obama's on course for an "absolute waxing" tomorrow. The way they've been talking about it, though, I'm confident the "race is over" meme is proof against a fairly heavy HRC win (but 45-50%? who knows). Obama's decision not to try in W.Va. was probably a smart one; his best hope is a low-turnout heavy-yawn primary. And then another in Kentucky next week.
N.B. The latest polls are roughly 60-25% for Hillary. I assume most of the undecideds will vote for her if they vote at all, since Obama isn't campaigning. High turnout implies something like a 75-25 margin for her. Sucks for her that it's probably too late to make a difference.