3 guesses: To which Muppet did Michelle Obama read 'Twas the Night Before Christmas'?

Here are three guesses speculating about which Muppet CBS News’ Mark Knoller was referring to:

Look, just because he has big ears… RT @markknoller: Mrs Obama reading "Twas The Night Before Christmas" to a muppet.

— Sunny McSunnyface (@sunnyright) December 6, 2013

https://twitter.com/Matthops82/status/409091209919881217

And this final guess is a vigorous defense of the Veep:

Don't call Biden a muppet. RT @markknoller: Mrs Obama reading "Twas The Night Before Christmas" to a muppet.

— jon gabriel (@exjon) December 6, 2013