The Atlantic has a very nice (and short) essay on how the current incarnations of the two parties work against their own fundamental interests. For example, the Republicans care a lot about financial markets--so they should be the ones working really hard to ensure the integrity of those markets. Democrats care a lot about the social safety net, so they should be the least tolerant of incompetent bureaucrats and wasteful government spending.
This is a more constructive insight than the usual complaints about Washington partisanship (including my own). Here is my favorite quote: "Our country would be in fine shape if we were going back and forth between the best version of American conservatism and the best version of American liberalism. Instead we're bouncing back and forth between degraded versions of both."