"FILE - In this May 3, 2012 file photo, U.S. Sen. Frank Lautenberg, D-N.J. smiles as he stands on the Rutgers-Camden campus in Camden, N.J. Lautenberg, at age 88 the oldest sitting U.S. senator, said Tuesday, Jan. 22, 2013 that the mayor of the state's largest city is entitled to run next year for the seat he now holds _ but he did not yet reveal his own plans. Newark Mayor Cory Booker likely won't be the only candidate ""drooling at the mouth"" over the job, Lautenberg noted while talking with reporters in Washington. (AP Photo/Mel Evans, File) Photo: Mel Evans"