Obama's 2008 was clearly the realignment that the Dems had been hoping for since Clinton 1992. Where states like NV, CO, PA and NH have offset the loss of Ohio river valley and the bible belt which includes MO and WVA.
Except Clinton won all 4 of those states, and won 3 of those states twice. Obama hasn't really gained the Democrats anything, except Virginia which was already turning blue in 2004.
Gore and Kerry lost a very close races in NV and OH and cost them the election, clearly NV 4 or OH 20 would have put either of them in the W.H., since 2000, not 1992, Obama did give Democrats something.