Shows how well informed Americans are. The key question, “No, it’s not just his birthplace that concerns me, but his father’s foreign citizenship,” receives only 2%.
A “natral born citizen” must have TWO American parents and be born in the US Mainland.
Legal references: US Constitution, Art. II, Sec. 1, Cl. 5; U.S. v. Wong Kim Ark, 169 U.S. 649 (1898); and Perkins v. Elg, 307 U.S. 325 (1939)
http://www.theobamafile.com/NaturalBornCitizenChart2.htm