I think the state GOP in CO sucks or is really weak right now. I don't know of any strong figures involved in that state and I don't think the guys running for office there have been anything special. So, I've been thinking that Dems may win state races there, but national races could be different because a strong national candidate transcends a weak state party.
It's just the state GOP has been really weak starting 2004, and they haven't done much to change that trend around for a while. Not sure, but they need to get their act together. If they want to keep on losing elections to the DEM, then it's shows them they don't care.
Romney may not write off CO and NV yet, but he can still win without these states. He would have to focus more on OH, VA and FL to win. CO is becoming a joke state to be honest for the GOP.