Republicans need to win 70% of the white vote to have an Obama 08 style victory

[All Along The Watchtower]

I can see Republicans winning 70% of the white vote (if not in 2016, maybe by 2020 or 2024). I don't see the white vote in the liberal parts of the country getting significantly more Democratic than it already is; on the other hand, the white vote in the more conservative parts of the country is getting more Republican with every election, it seems. And I don't think there are enough white liberals outside the major cities of states that the Democrats are already winning to counterbalance it.

Also, demographics aren't exactly favorable for white liberals (insert cliche about conservatives having more children than liberals). White Millennials still vote Republican nationwide, and the younger and middle-aged generations of voters in regions like the South, parts of Appalachia, etc. are almost as  Republican as their older (and far more Republican than the surviving remnants of the GI Generation) counterparts.