Remember the monster movies of the past?
They always reflected the times in which they were made. Movies of the 1950's like Invasion of the Body Snatchers or Invaders from Mars were satires on the rigid conformity of the era. The 1960's had their horrors of nuclear annihilation and science run amok themes. The 1970's and 1980's had their inner demon angst.
Here in 2011 we have Zombie's galore. You know zombies, the creatures risen from the dead bent on eating the brains of normal Americans. They dress funny and shuffle along like geriatric patients in search of prunes. They cannot be stopped in their mindless pursuit of their goal. They will do anything to get what they want.
Today we have the Tea Party. To them people with brains are the enemy. They love to play dress up. A lot of them are of advanced age. They mindlessly pursue money. They want to infect you with their ideology. They will do anything to get what they want.