Some do, but I bet most fall into the camp that he isn't a Natural Born Citizen simply by the fact he wasn't born to two citizen parents. A legal loophole not all that different than the one that prompted congress to act on McCain's NBC status due to his Canal Zone birth.
My “birther” comment is that he chose to run for the office so the onus is on him to prove that he’s eligible. The onus isn’t on Orly Taitz or anyone else to prove he’s not, especially since the only source of the proof is the document that Hawaii won’t release.
Until I see an authentic long-form birth certificate with a doctor’s name and the hospital info I won’t consider him my president. He’s just a guy that lives in that house.