From the FAQ:

"Are you tired of Hollywood's outspoken elite making ignorant political statements? Do you boycott all Barbra Streisand or Alec Baldwin movies? Then political movie ratings are for you.

"We at CelebPolitics.com have tried to quantify how liberal movies are based upon a mathematical formula. This way, you can make informed decisions about which movies you will see, and which movies you will boycott because of particularly outspoken liberal actors. Supporting conservatives has never been easier!"

Oh. Well you can't argue with math.

This would actually be interesting if they rated movies based on political messages in them, rather than aggregating the ratings of a group of actors who happen to co-star in a movie. That amounts to one big ad hominem attack that has little to do with the movie in question. It would also be funnier if they weren't dead serious. Sad.