Recently, Berinsky [YouGov’s Adam Berinsky] polled the question again, focusing on Republicans to see if their attitudes have changed in ten months since the president released his birth certificate. Far from getting better, Republicans have actually doubled-down on the belief that Obama is foreign born:
There even continues to be a pretty strong birther strain in Iowa. 48% of Republican voters believe Barack Obama was born in the United States but 32% still do not.
The idea that the birth certificate is the real story and that Osama bin Laden is the distraction tells you everything you need to know about the Birthers.