Any particular reason why Colorado is about the only swing state that is (or appears to be) swinging towards Romney?
One reason may be the very same reason that Ohio and Michigan are actually swinging back towards the president: Bain. The whole class warfare business works well against a wealthy, moderate, northeastern Republican among blue-collar independents and even Republicans in the working class burghs of the Midwest. It's a completely different electorate in Colorado, where the president is extremely unpopular and Romney's suburban politics hit a sweet spot in and around Denver.
I wouldn't be at all surprised to see Romney win Colorado, and lose most of the other so-called "swing states."
And, I'll add, Colorado has always been more of a right-leaning swing state, anyway. So perhaps it shouldn't be that surprising after all.
Except that Ohio and Michigan aren't actually swinging toward Romney. They've both moved noticeably towards Obama in the past month or so:
http://www.realclearpolitics.com/epolls/2012/president/oh/ohio_romney_vs_obama-1860.html
http://www.realclearpolitics.com/epolls/2012/president/mi/michigan_romney_vs_obama-1811.html
No, you misunderstand, he's admitting that it's working in Ohio and Michigan but saying that it's a different story out in Colorado.