Don't bet on it Tom.
Hillary and McCain both have extremists in their cadre of acquaintances. You just haven't had them paraded in front of you because the Obama camp has chosen to not go there. His supporters will however if he starts falling too far in the polls and it won't be pretty.
McCain has wisely stayed on the sidelines on this one because he has some very vile alliances. Hillary's are just starting to come out.
Art