Black lawmakers claim protesters shouted racial epithets as they walked to the Capitol to vote for health care reform last month. Andrew Breitbart published a video conclusively proving that this didn't happen, even though it was filmed an hour later.

What is truth? How do we know what we know? Philosophers have struggled with these questions for centuries, but Republicans have found an answer: if it wasn't filmed and uploaded to YouTube by a Teabagger, it didn't happen. Period.