Rick Santorum would not be pleased about this man-to-man singing. President Obama was at Harlem's Apollo Theater Thursday night for a fundraising event, and when he was on stage giving a speech, he started singing. "I ... I'm ... soooo in love with you," Obama crooned a bit of the Al Green hit "Let's Stay Together," to, well, Al Green, who was in the audience. "I just wanted to show my appreciation," the POTUS said.