He is not President in the strict sense. So, he is not the President, he is a usurper until he proves otherwise. It only cost 12.50 to prove it. Obviously, he can’t or he would.
You people are delusional. He is president in the strict sense and the entire Supreme Court would tell you so. Chief Justice John Roberts swore him in for God's sake. The onus is not on Obama, it is on those challenging him. Should one of these Supreme Court suits actually be given the light of day, then he might have to prove it. Until that absolute fantasy comes to be, this is all a ridiculous drama to avoid addressing the real issue, which is that the country is continuing to move away from conservatism.