There is a lot of talk on this, but has anyone taken any substantive action yet?
Not that I know of. Until he gets nominated, his qualification questions wrests with the DNC.
After nomination I don't know if there is a boilerplate requirement by federal or state election authorities to present Presidential qualification documents, IE: birth certificate to satisfy age and natural born status. Until this year it has never been questioned, now we will have 2 who were born outside the US proper.
Under the laws of D.C. and fifty states, a nominee for President must sign an official designation of his/her Presidential Electors. Only at that point can anyone in any of those 51 jurisdictions file suit claiming that Obama is not qualified under the US Constitution to be President, and therefore unqualified to sign that designation.
The cases could be in state or federal court, though I would expect federal would be preferred. And there is zero doubt that with up to 51 different cases, there would be two that disagreed. Therefore, the issue would reach the Supreme Court on an accelerated basis to make the mega-decision, either yes he is qualified, or no he is not qualified.
Congressman Billybob
Tenth in the ten-part series, "The Owner's Manual (Part 10) -- The Remaining Amendments"
Latest article, "A Scandinavian Skeleton in a Southern Closet"