New York Magazine, 2011-11-20, has two interesting articles on the current manifestations of the political parties: "When Did the GOP Lose Touch With Reality?" by David Frum and "When Did Liberals Become So Unreasonable?" by Jonathan Chait.
"Conservatives" who tout individual freedom don't want anyone to express an individual opinion contrary to "conservative" dogma. "Liberals" who think their politicians will bring change abandon the politicians when they only bring about some change.