NEW YORK (AP) — Sen. Marco Rubio has a book deal.The Florida Republican has signed with Sentinel, a conservative imprint of Penguin Group (USA), for a memoir tentatively scheduled for Fall 2012. Sentinel announced Monday that the book was currently untitled.Rubio, 40, is a tea party favorite who has often been mentioned as possible running mate on the 2012 GOP presidential ticket. The Cuban-American Rubio has said he would not accept such an offer because he's focused on being a U.S. senator.