Ultimately, I blame the whole "rich get richer, poor get poorer" effect for our current economy; when all is said and done, there will be 10 rich people in the world that give hand-me-outs to the other 6 billion.
Ok, a little stretched there.
But all the same, "A house divided against itself can not stand", and the U.S. is definately a house divided politically. Less government and tax is good, but corporate despots aren't, and in a free-market, the corporate big-wigs end up replacing the government ones.