Colbert was speaking about an AgJobs bill, which would bring citizenship to illegals that work in Agriculture. These are the fruit/veggie pickers in the country.
As such, Colbert was asked to leave - and many are still talking about the appearance. He did it in character, and his humor was appreciated more by the press than it was the actual politicians he was addressing.
When asked if he was an expert after spending a day on a farm, Colbert replied that studying anything for a day makes him an expert (he was being sarcastic.)
Here's the video of Stephen Colbert goes to Washington...what do you think?