Secretary of State Bayard ruled under Section 1992 of U.S. Revised Statutes in 1885 that although Richard Greisser was born in the United States, his father at the time of his birth was a subject of Germany, and thus, Richard Greisser could not be a citizen of the United States. Furthermore, it was held his father was not subject to the jurisdiction of the United States under the Fourteenth Amendment.
http://federalistblog.us/2008/11/natural-born_citizen_defined.html
Clearly, the nationality of the father is important and still continues to be important today.
http://sanmarino.usvpp.gov/crba.html
If this website is correct..notice the difference between requirements if married versus out of wedlock (which may be the case for Obamanazi since his father was already married..just another twist in the convulated mess)
b) One parent is a U.S. citizen, and that parent has been physically present in the U.S. for a period or periods totaling not less than five years, at least two of which were after attaining the age of fourteen years (for children born before Nov. 14, 1986, the parent’s required period of physical presence in the United States is longer).
An unmarried American citizen mother with at least one year of continuous physical presence in the U.S. can transmit U.S. citizenship to a child born abroad out of wedlock.