2020- Democrats begin to solidify western base, exurbs are gaining power in Midwest.
2030- Democrats expand with their new western base, solidification of the "New South" as immigrants and white collar workers continue to move in. Republicans continue to gain as the Midwestern cities continue to crumble.
2040- GOP expands into the Northeast as more liberals move into the New South and West.
2050 - Liberal flight from CA....continued Northward expansion of the exurban GOP base and the expansion of the "New South" into marginal areas and perhaps enough outsiders finally begin to overrun to the Mormon states? No one wants to live in Wyoming, so its pretty much stuck in time.