New Jersey U.S. Sen. Frank Lautenberg  says he will not seek re-election when his term ends in 2015. The 89-year-old Democratic lawmaker is the last remaining veteran of World War II in the Senate and has been elected easily five times but was facing a likely challenge from charismatic Newark Mayor Cory Booker.  Lautenberg is a staunch advocate of gun control and public infrastructure and is a champion of the Amtrak railroad. He first won election to the Senate in 1982.