It's not exactly news that voters tilted away from Democrats in a big way between 2008 and 2010; Republicans regaining control of the U.S. House with a sizable majority demonstrated that.
But Gallup Organization provides us another view with an analysis of party affiliation in the states. The pollsters report that solidly Democratic states dropped to 14 in 2010 from 30 in 2008. Competitive states rose to 18 in 2010 from 10 in 2008.
Interestingly, Democrats losses in terms of voters claiming affiliation haven't led to commensurate Republican gains. There were only 10 states in 2010 that either leaned or were solidly Republican, Gallup said, up from five states in 2008.
It all suggests that the difficulty factor for President Obama's re-election has gone up to some degree. He still has the benefits of incumbency, of not likely having to endure a primary challenge and of a campaign war chest some are estimating will be $1 billion.
But if the map stays as it is or deteriorates further from his perspective, he'll need every bit of those advantages.