I wonder what a birther Obama supporter is like.
Probably someone who isn't aware that the President needs to be "naturally" born. A lot of people being polled are probably not even aware there is a controversy.
Probably quite a few people don't know that the president has to be a natural-born citizen and assume that because Obama has a foreign-sounding name, he must have been born abroad. Also, I would wager that an embarrassingly large number know he was born in Hawaii but don't know Hawaii is part of the U.S., or think it isn't a state and therefore isn't covered by the natural born citizen requirement.