Well, in 2052 or at least the 2052 I was projecting American politics looked more latin american in some ways. The democrats looking like Chile's Christian democratic party[1] while the GOP is a party ranging from euro-style liberal-conservative with some more socially conservative elements being conservative-liberals.
Essentially, this is an America that's a nation which looks inwards, never really recovered from the great recession and is mostly latin in population[2].
Democrats
foreign policy: Pacifistic, favor foreign aid
Economics: social market economy/pro-worker corporatism, protectionist
Social issues: moderate, status quo, states rights, anti-abortion(squishy moderate with a moralistic tone)
GOP
foreign policy: General isolationist.
Economics: Favors a freer market, lower taxes.
Social issues: states rights, anti-government lean, law and order(secular center-right?)
[1]
http://en.wikipedia.org/wiki/Christian_Democrat_Party_(Chile)
[2] Demographic inertia, differential birthrates, kids of anglo-latin relationships choosing to identify with the group that gets AA and the fact that a US which had a 90s Russian-style collapse is still the land of plenty compared to Mexico. However, unlike what Pat buchanan would say they're not spanish-speakers or would-be secessionists.