I believe it has been shown mathematically that there is a high probability of intelligent life in the Universe, besides mankind. That said, we still do not have definitive proof. Most of the people who claim to have had contact are certifiable lunatics. When one makes an incredible claim, it is incumbent they provide incredible proof. If they do arrive on the front lawn of the Whitehouse, so their existence cannot be denied, I am confident the religious fundamentalists will continue to deny they exist and claim it is a government conspiracy to attack their faith. For me, I hope to live long enough to see it