Meanwhile, the requests for publicly available information on Obama's birth continue to come into the Hawaii Department of Health.
The agency had received 27 requests so far this month, as of last week, up from 16 requests in November. Earlier this year, officials were fielding up to 50 requests a month for a copy of Obama's certificate, according to the Honolulu Star-Advertiser.
Former Gov. Linda Lingle, a Republican, signed a law in May allowing the department to ignore repeated requests, many of which came from the same person with several aliases.
A "certification of live birth" posted online and viewed in-person by reporters from several independent news outlets shows that Obama was born in Honolulu at 7:24 p.m. Aug. 4, 1961.
It lists his father, Barack Obama Sr., and mother, Stanley Ann Dunham.
The nonpartisan group FactCheck.org determined the document was authentic, writing on its blog, "Obama was born in the U.S.A. just as he has always said."
Archives of two local papers -- the Honolulu Star Bulletin and Honolulu Advertiser -- also contain birth announcements for a young Obama son in early August 1961.
Still, 14 percent of Americans say, without prompting, that they think Obama was born in another country, according to the most recent ABC News-Washington Post poll.
But for many, it's not a firm belief, and some appear not to hold it against him, the findings reveal.