FILE - In a Saturday, June 8, 2013 file photo, Newark Mayor Cory Booker announces his plans to run for the U.S. Senate seat that opened with the death of Frank Lautenberg (D-N.J.) durin

 

              FILE - In a Saturday, June 8, 2013 file photo, Newark Mayor Cory Booker announces his plans to run for the U.S. Senate seat that opened with the death of Frank Lautenberg (D-N.J.) durin
FILE - In a Saturday, June 8, 2013 file photo, Newark Mayor Cory Booker announces his plans to run for the U.S. Senate seat that opened with the death of Frank Lautenberg (D-N.J.) during a news conference in Newark, N.J. Booker, 44, is currently serving in his second term as mayor. At center is former Sen. Bill Bradley. (AP Photo/Rich Schultz, File)