Are actually making that claim, or is that an attempt to archly demonstrate the point being made? Because if you're seriously making that claim as others had, I can barely count the number of fallacies and debate style errors it contains with both hands.
If you weren't trying to provide an example of how explicitly partisan debates can just shut down all conversation, you still did a good job.
I actually posted it initially without the double quotes, but then realized I would see a lot of posts like yours so edited it very quickly to add the double quotes in.
Did he say it first? The first page of Google hits is covered with Colbert saying it at the Correspondents' Dinner in 2006.
Edit: here it is, "I know there are some polls out there saying this man has a 32% approval rating. But guys like us, we don't pay attention to the polls. We know that polls are just a collection of statistics that reflect what people are thinking in "reality." And reality has a well-known liberal bias."
If you weren't trying to provide an example of how explicitly partisan debates can just shut down all conversation, you still did a good job.