The biggest change came among Republicans, as 14% now say Obama was born outside America, down 17 points from last April when 31% of GOPers said the same thing.
A PPP poll released earlier this week found a similar drop in the percentage of Republicans who believe Obama was born outside the U.S.
In February, PPP found that just over half (51%) of Republican registered voters nationwide thought Obama wasn't born in America. In a follow-up poll released this week, that number fell 19 points, to 32%.
Skeptics had been demanding that Obama release his long form birth certificate for years, speculating that the lack of a birth certificate meant Obama could be foreign born, and thus inelegible to serve as president. After the issue was dragged back into the national spotlight this spring -- fueled largely by the constant flame-fanning of reality television personality Donald Trump -- Obama provided copies of his long form certificate to the press, saying there were more important issues at hand than "a sideshow and carnival barkers."
The Washington Post/ABC News poll was conducted April 28-May 1 among 1,006 adults nationwide. It has a margin of error of 3.5%. The PPP poll was conducted over the same period among 1,002 registered voters nationwide, and has a margin of error of 3.1%.