Wait. Are you trying to argue that Romney has no foreign policy experience? If so, that would be a weird argument, considering four years ago.
If not, then the argument comes down to how well Romney would be at handling foreign policy issues as compared to Obama. It used to be that Obama had a significant lead over Romney in that category, but that lead has since greatly diminished, meaning that people have either soured on Obama (i.e., they saw his handling of the Libya situation), they have come to agree with Romney on some foreign issue (i.e., tough trade regulations against China) or a combination of both.