Happens in EVERY election. Any state AG can throw Obama off the ballot and order him to show how he is constitutionally qualified. BTW, same is true for any candidate.
No guts. And no AG apparently wants the glory.
Kind of wish that were true, but it would depend upon that state's election laws. At present, I doubt that any state's statutes would authorize such an action by its AG, and even if any AG did so, it would require, as you hint, a lot of guts.
That's why a federal constitutional amendment, or federal legislation along the lines I suggested earlier this thread, would, IMHO, be necessary in order to enforce the Article II constitutional requirements for the presidency and vice presidency.