Actually Geraldo is showing us all something important here. There is not only one angle to promote Paul's foreign policy. If we want people to get on board, we need to find as many angles as possible to promote the foreign policy. The Lord knows the MSM won't help us.
1) The troops are tired of fighting. 2) The troops want to see their families again. 3) This is getting too costly, and we can use the money back home.
It does not always have to be a constitutional argument. You can also add that bit, once someone starts to soften up. You can also start talking about how soldiers think the whole thing is a mistake, too. These two arguments are not always the best thing to say, at first.
Basically, soften people up and acknowledge what they are saying, even if it sounds like a talking point.