What accounts for the striking partisan differences in public perceptions of global warming? As I've detailed (here and here), it's a combined result of strong opinion-cues from party leaders and the ideological safe zones created by Fox News, political talk radio, the WSJ, conservative columnists, and other right-wing venues.

Now comes more data on global warming's "Two Americas," from a recent National Journal survey of Congressional members. There aren't many details given on the nature of the sampling or its representativeness, but the gulf in perceptions is gigantic enough to be confident that there are seismic differences in views between the two delegations when it comes to the reality of human-induced climate change.