65% of South Carolina Republican voters unsure Obama was born in the U.S.

http://www.publicpolicypolling.com/main/2011/08/perry-dominates-in-south-carolina.html#more

Q26 Do you think Barack Obama was born in the
United States?
Yes.................................................................. 35%
No ................................................................... 44%
Not sure .......................................................... 21%

http://www.publicpolicypolling.com/main/2011/08/perry-dominates-in-south-carolina.html#more