Bob Barr, Libertarian, allowed to debate?

Why is the oldest and largest third party not allowed at the presidential debates?  I say let Bob Barr, our Libertarian candidate, debate Republican John McCain and Democrat Barack Obama!

Here's Bob Barr on the subject:



I made this political t-shirt for myself:

And this Libertarian t-shirt:

End the two party regime!  Let the Libertarian candidates debate! Why just choose the lesser of two evils?  Vote Libertarian.