Ok, so while I normally try to pretend to be non partisan (and people on both side hate most of my ideas), this particular image caught my attention.

This is the end result of a study by Princeton political scientist Larry Bartels. Of course, there may be other factors in here, we elect republicans when the economy is bad, democrats make it bad for the next guy, who is usually republican, but it is still interesting. Look at which dierection the curves go in.