In election, sidebar issues like this sometimes are as important as the ‘main issues’. The idea is to slowly peel people’s confidence on him by showing the possibility that he faked his own ID, or obtained it illegally. It should never be the main issue in which the opponent run on. In fact, the opponent should never bring up such issue. Let other people do it.
Evidently they were important to Obama when he was running for lower offices. IIRC he "won" his first office by getting signatures disqualified from his opponent's nominating petition. He won the Senate contest in large measure by getting a crooked court to unseal the previously-sealed divorce records of his opponent. Obama is nothing if not a master of the dirty Chicago-style politics. Of all the players in this tawdry tragicomedy of a presidency, Obama is the one most deserving of payback of a kind close to what he has dished out to others.