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... we find that back on February 28, 2008, Sen. Claire McCaskill (D-MO) introduced a bill to the Senate for consideration. That bill was known as S. 2678: Children of Military Families Natural Born Citizen Act. The bill was co-sponsored bySen. Barack Obama (D-IL), Sen. Hillary Clinton (D-NY), Sen. Robert Menendez (D-NJ), and Sen. Thomas Coburn (R-OK).
Bill S. 2678 attempted to change article II, section 1, clause 5 of the Constitution of the United States with reference to the requirements of being a “natural born citizen” and hence; the entitlement to run for President of the United States. This bill met the same fate that similar attempts to change the Constitution have in the past. Attempts such as The Natural Born Citizen Act were known to have failed and the text scrubbed from the internet, with only a shadow-cached copy left, that only the most curious public can find.

Source

S. 2128:
108th Congress
2003-2004

A bill to define the term “natural born Citizen” as used in the Constitution of the United States to establish eligibility for the Office of President.

Sponsor: Sen. Don Nickles, [R-OK]
Cosponsors [as of 2008-11-10]: Sen. James Inhofe [R-OK]; Sen. Mary Landrieu [D-LA]

http://www.govtrack.us/congress/bill.xpd?bill=s108-2128