He should show up, maybe when he says something intelligent, hillary and obama might understand, and actually "debate". Notice how McBain just smiles and laughs when Ron Paul Talks. Mitch has the deer in the head lights look. Since Hucksabee wasn't in the camera very much, Can't really speak for his behalf.
Also remember Ron Pauls base is made up of a lot of former democrats and independents. I said this from the get go we will never win over the base of the neocon party we need those indies and dems.
The MSM and other candidates would probably try to spin it against Ron Paul saying he finally showed up at the debate that he properly belonged at since they are constantly trying (in vain) to say that he is less Republican.
Of course then he could just spin it back to them and say that out of the Republican candidates he was the only one man enough to take on the challenge that Anderson offered and show that he could take on the Democrats no problem.