You're being snarky, but ...
I think historians will look back on 2008 as the year the Reagan Revolution ended. I think that's when the US (as a whole) realigned from a center-right to a center-left nation.
I'd go a step further and say GWB (specifically the Iraq war & the 2007 financial collapse) had a lot to do with it. The GOP overplayed their hand and alienated a generation.