Brownback is losing independents by 15%, there is no way that he wins with numbers like that. Plus, Davis is only at 85% with Democrats, so he's got room to boost that by at least 7-8%.
That is not a comeback for Brownback. But, some people will screech, "IT'S NOT OVER"!!!!!!
Brownback can win even if he loses the Indy vote in a landslide - all he needs to do is consolidate the GOP.
Brownback has been campaigning hard for the past month - it doesn't surprise me to see him tying it up. He is a much better politician than Roberts.
I think you are forgetting that a big chunk of the Republican vote is from independents, so no, Brownback cannot lose independents in a landslide and still win.