From the link: But that leaves almost six of 10 Americans uncertain about the president's birth – and therefore his eligibility under the U.S. Constitution to be president.

WRONG. You do NOT have to be born in the US to be president. You have to be a natural and not naturalized citizen. Being born in the territory of the US is one way to be a natural citizen. It is not the only way.

Icky (as is the article) also is a bit misleading about the results of the poll. If 42% think he was definitely born in the US, and 29% think he was probably born in the US, that's 71% of people who don't have a problem with his eligibility to be president. That's a LOT more than 50%. That's a supermajority. A supermajority of people polled have no problem with Obama's eligibility to be president.

Maybe right-wingers misunderstand the meaning of "certainty". Indeed many of them say they are "certain" about things they most definitely are not, by any reasonable meaning of "certain". If you haven't been following the whole birther thing, you might well say he was "probably" born in the US. That's what I'd say about Shrub, because I have no idea where he was born, and don't care. I know his parents were US citizens, so it doesn't matter if he was born on the moon -- because I know what is required to be a natural citizen of the US.