President Barack Obama reflects on saturday about what the number one thing people at the time wanted him to achieve when he was elected president(im assuming this was from the vote poll questionaire that was online years ago) - "find whats going on at Area 51" he mentions.
Then he mentioned surprisingly he'd have to simply ask Shirely Maclaine to find this out (she was seated as a speaker at the event).
MacLaine has previously stated that she has seen UFOs. (See her candid Oreily interview)
Obama then mentioned "I think ive become the first president to ever acknowledge area 51!".