The previous post got me thinking about the level of geographic polarization in 2004 and whether or not it has changed now that President Bush's approval ratings have fallen so significantly. I looked at Bush's approval ratings in all 50 states (provided by Survey USA) and compared them to Bush's vote in 2004. The following regression graph shows that Bush's decline has been remarkably consistent across all 50 states, with no real outliers. The coefficient for Bush's 2004 vote is .86 and it explains nearly 90 percent of the variance in Bush's 2006 approval ratings.
(Click on the graph to see a larger version.)