I agree he was a petty con artist, a crucial witness to a federal crime investigation. Whether he actually had such information about Obama can never be ascertained, he is dead.Given Obamas self censorship of his documentation of record, ,my assumption is that Quarles Harris did indeed have such information.I agree with you that it is an assumption, but none the less, a logical one.
We do know that both Hillery Clinton's and Obama's State Departent files had been illegally accessed months prior to Harris's murder, but we do not know by whom.
As I remember it, the man who admitted to breaching the passport files worked for John Brennan, Obama’s head of national security. Brennan was at the time, handling Obama’s campaign security. The man who breached the files, (his name might have been Harris) was cooperating with the FBI and was waiting in his car for a secret meeting with an FBI official, when he was shot by a sniper and killed. End of story, end of passport breaching investigation.