We shouldn't get too carried away with a red state-blue state civil war motif, since most states aren't that homogeneous. Romney only cracked 2/3rds in three states and Obama only got above 2/3rd in Hawaii and DC. Michigan, who last voted Republican for president in 1984, was only 54-45 Obama.
There is a cultural divide between the rightmost quarter of the electorate and the leftmost with the middle half largely in play. For instance, a number of liberal-oriented ballot proposals got shot down in the 60-40 range while Obama was getting 54%; that makes 15% or so of the electorate here pro-Obama but anti liberal overreaches on mandating green energy and banning state regulation of union contracts.
That 15% is reachable, but wasn't reached by Romney or Pete Hoekstra.