That is hilarious! I love The Colbert Report. I'm a vegan too, so it was especially fun to watch. Peter Singer seems quick and witty.
Unfortunately, thanks to Colbert's comments (I realize he's trying to be funny, but he comes across as too serious), I think that segment only serves to further cement people's meat-eating.
I think you are right that on its own, it could simply serve to further cement meat-eating. However, in the context of the philosophy classroom, this would be a good thing to discuss as well. My hope is that students learn to think critically and philosophically in my courses, and if they are able to transfer these abilities over to how they interact with media and popular culture, so much the better for them in the long run.
A bunch of videos of talks on ethics & animals (all given in Germany a few years ago), including those by Tibor Machan, Tom Regan, Carl Cohen and Mylan Engel were recently posted here: http://youtube.com/profile_videos?user=rainerebert&p=v
Another resource for you: http://www.ng2000.com/fw.php?tp=animal-rights
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