u.s.? 42% said yes. probably yes, 29%. probably no, 16%. those numbers really haven't changed a lot from july of last year to march of this year. they are still in the same ballpark but these were still significant weighty numbers for a president in office to have to deal with. that many people still question whether or not he might even be legitimate. after all of these events that we saw out there, finally after all this time, we have the paperwork that says there is a difference in the detail we can see now compared to what we saw before. wolf? >> thanks very much. donald trump is taking credit for the release of the president's birth certificate. he's been staking out his possible presidential bid on this so-called birther issue. and now says and i'm quoting him now, i've accomplished something nobody else was able to accomplish. trump was in the first primary state of new hampshire today. that's where cnn's chief national correspondent john king is right now. he landed the first interview