The increasing number of evangelicals number is bad news. That's enough to still overinfluence the political system. I'd rather us more Catholics and Lutherans than those types.
20 million more religious unaffliated in 7 years is pretty remarkable, especially during poor economic times.
Remarkable, but hardly surprising. Fewer and fewer people see the need to belong to organized religion, don't want to be hypocrites, can't bring themselves to believe, etc.
As RINO Tom pointed out, though, let's not confuse "Unaffiliated" with being an atheist, or even an agnostic.