Many of the Republicans that I have talked to about Ron Paul will say things like "I agree with everything he says, but his foreign policy sucks."
Usually when Ron's asked about foreign policy he explains that these wars are unconstitutional and unaffordable. He also goes into the concept of blow back and explains that terrorism is a consequence of occupation, rather than an attack on "who we are." These are good points to make when addressing a rational person.
Beck slammed Paul today over his statements about the motivations behind 9/11. This will be a big theme amongst the talk show mafia today. Be prepared.