Pretty sure this is impossible barring a constitutional amendment. Currently the presidency is available to only "natural born citizens", and I very much doubt an advanced AI would be considered such.

What if it's an AI posing as a person?

@VanessaKosoy I can imagine some dude-bro politician saying he will only perform the acts and responsibilities of his office as advised by an AI. I'd put Mana on it.

Question implies that it will be "elected" as president - two questions

1. Elected as the president of what?

2. What if it is not elected but assumes the position through some .. other way?