I've started commentary on some of them because they pissed me off that much.

• I'm only speeding because I have to POOP.
• Evolve, damnit!
• My other car is...also a piece of shit.
• Real Men Love Cats.
• The more people I meet, the more I like my dog.
• Pro child, pro family, PRO CHOICE.
• Are you having phone sex or do you always drive that way?
• 49% bitch, 51% sweetheart, DON'T PUSH IT.
• Don't make me call my flying monkeys.
• Dissent is the highest form of patriotism.
• Jesus is coming, everybody look busy!
• NO FARMS, NO FOOD.
• Got Poop?
• Darwin Loves You.
• Give wildlife a BRAKE!
• Save the crabs...and then eat 'em!
• NObama!
• God bless the whole world. No exceptions.
• Public school? What about SOCIALIZATION? (I didn't understand this one at all :/)
• Someone else for president.
• Obama Oprah '08
• Honor thy plumber.
• IMPEACH Morty Seinfeld.
• My children have fur.
• 333. I'm only half evil.
• I look like Demi Moore...from the knees down.
• Ferrets rule, children drool!
• HERO (with a picture of John McCain in the O) and ZERO (with a picture of Barack Obama in the O: This is just ridiculous. Okay, you voted for McCain, we get it. You obviously don't agree with Obamas policies but does that really make him a complete ZERO? No. You lost, better luck next time.
• CHANGE you will submit to. (Accompanied by a picture of Barack Obama dressed as Osama bin Laden with his name in Arabic script): This is even more ridiculous. Comparing Barack Obama and Osama bin Laden is horrific and just plain ignorant.
• 93% of women regret their abortion.: Yep, I'm really going to get my statistics info from your shitty, close-minded bumper sticker.
• I have a PBS mind in a FOX News world.
• Do not meddle in the affairs of dragons for you are crunchy and good with ketchup.
• PALIN: Yep, JUST a Palin sticker. Not a McCain and Palin sticker like you usually see, but just a Palin. Are. you. kidding. me?
• My other car is a mosh pit. This doesn't even make sense.
• Tell your boyfriend to stop texting me.
• God said it. I believe it. End of story.: Logical argument you have there, pal.