I was able to see an ABC 1982 special called
I Love Liberty recently. Big Bird and The Muppets made an appearance in the special, putting on a raucous version of the play
1776! They were there to demonstrate how the founding of our country was frought with turmoil and disagreements, but somehow they still managed to come together to form the Declaration of Independance.
There was also a speech made early in the show (I wasn't sure who the actor was who said it, but obviously a well known person). Basically he said part of what makes liberty great is our ability to have open minds and see all points of view (something that both liberals and conservatives need a lesson in btw! Heh). Also the teachings of a man from 2000 years ago, who said the least will be counted among the greatest.
I have to say, while the special was definitely corny, it was also very touching.
Here's the Muppet Wiki description, featuring some of Martin Sheen's exchange with Big Bird and the Muppets' version of
1776!
http://muppet.wikia.com/wiki/I_Love_Liberty