I think they're including Ron Paul in the hopes he will say something outlandish.
Having Paul on the stage is being done to embarrass Republicans and to give them less credibility.
It is kinda like putting the crazy uncle in the middle front of the photo at the Family Reunion.
Or maybe they are including Paul because he got almost as many votes as McCain and Thompson in Iowa and nearly three times as many votes as Guilliani. And maybe they aren’t including Hunter because Hunter was only able to get a measly less than 1% of the vote in Iowa. Paul got around 20 times as many votes as Hunter. Hunter is out this race. The only people that don’t know that yet are Hunter and his most ardent supporters.