I have read that you can judge your success in life by the stature of the enemies you have made.
Obozo has directly tried to punish and silence Sheriff Joe.
Sheriff Joe is the real deal. And he is smart. He is pursuing this better than anyone else. He may actually get results. The previous problem has been denial by the court of the cases due to lack of standing. The Sheriff has pursued this on the basis that documents were forged and whoever forged them broke the law. Not a direct assault on Obozo, but will accomplish the same thing if the forger is identified. I suspect they currently have a good idea who did it.
I don't care about the birth certificate. Sheriff Joe claims to have evidence that Obama falsified his Selective Service registration. This is a crime and Joe Arpaio is a law enforcement official. He has the power to subpoena documents and witnesses.
So, his cold case posse seemed to find evidence of myriad examples of fraud committed by Obama and others serving his interests. What's he waiting for?