Both parties desire for eternal war and world policing.
Both parties hatred of privacy rights.
The overall culture of degeneracy, immorality, greed, and intolerance (yeah, I put them all in one line you everything is left/right people).
Corporatism running the country.
Not enough resources put into public transportation, alternative energy, ecological concerns in general.
It's amazing how, with one exception, those are all things I applaud phrased in a negative fashion (you can get rid of the words 'eternal' and 'intolerance' too, actually).