Former U.S. Sen. Bill Bradley, right, introduces Newark Mayor Cory Booker during a news conference in Newark, N.J. on Saturday, June 8, 2013 to announce Booker's plans to run for the U.

 

              Former U.S. Sen. Bill Bradley, right, introduces Newark Mayor Cory Booker during a news conference in Newark, N.J. on Saturday, June 8, 2013 to announce Booker
Former U.S. Sen. Bill Bradley, right, introduces Newark Mayor Cory Booker during a news conference in Newark, N.J. on Saturday, June 8, 2013 to announce Booker's plans to run for the U.S. Senate seat that opened with the death of Frank Lautenberg (D-N.J.). Booker, 44, is currently serving in his second term as mayor. (AP Photo/Rich Schultz)