Boo your candidate for calling the other guy a decent man, because people who get booed by their own supporters are perfectly positioned to come from behind in a crucial election. Awesome.
Boo your candidate for calling the other guy a decent man, because it's so crazy and unreasonable for a politician to show his opponent basic courtesy.
Boo your candidate if he won't go along as you call Obama "an Arab," because A) Being an Arab is such a terrible thing that you can just cite it as a reason not to elect somebody, and B) The fact that "Arab" is a defined ethnicity and Obama can't be considered any kind of arab by any known standard probably won't come up. I wouldn't worry about it if I were you.