Yeah, I'm sticking with Manchin here. My opinion of him has gone up in recent months, and I respect that he's better than any WV Republican would be, but as long as continues to parrot that "War on Coal" nonsense I really can't move him from the bottom. (And there's also this.)
I like Reid, actually. He's a lightning rod because a) he's the Majority Leader, and b) he's taken a couple not-too-great positions by dint of Nevada being purple (until recently?) as well as, I guess, his Mormonism. But he's a fighter, he's good at playing the legislative game, and we need that sort of fighter in that position.
Reid is actually pro-marriage equality now. Hasn't gotten excommunicated either.
My opinion on the worst Senator is whoever is the least progressive for how progressive their state is. Probably the California senators.