I thought I'd also flag up two articles:
http://www.nytimes.com/2008/08/31/bu...in&oref=slogin
http://www.slate.com/id/2199810/
Both examine similar statistical measures. It's fascinating to see that apparently, the Democrats have historically done a better job of running the economy. Not only that, but the Republicans have also massively benefitted the wealthier compared to the poorer.