Uh, what's so terrible about him?
He doesn't seem to be able to respond, effectively, to Burns's campaign getting it's act together. The warning signs were there and he either ignored them, or has proven to be utterly unable to land any blows unless everything is going his way. I could be wrong, but it looks as though he took his foot off the proverbial pedal when he started to get double digit leads.
"F***ing awful candidate" is probably too harsh though. And maybe I'm being too harsh in general.
He might still win, and I hope he does; Burns isn't just a terrible Senator he's a terrible excuse for a human being. Even Tom DeLay had a good side, of sorts, even if it was tiny. Not seen any evidence of even that for Burns.