A little quiz for all Americans(USA)!!!

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Can u tell which american president appeared in the telivision series Laugh-in?? this was the last question in a Who wants to be a millionare show(USA) (for my indian friends,like kaun banega karodpati in india),and i guess many of u will know what thst guy did, he took his last life line, phone a friend, called his dad, and told him that he jus called him to tell that he has won 1million $, that secne was really great. So guys the answer?? And some more info. if u have?