New Jersey Gov. Chris Christie, center left, laughs with Newark Mayor and Senate candidate Cory Booker in Newark, N.J., Wednesday, Sept. 25, 2013, during a ribbon-cutting ceremony for Newark charter schools. (AP Photo/Mel Evans)

Photo by: Mel Evans

New Jersey Gov. Chris Christie, center left, laughs with Newark Mayor and Senate candidate Cory Booker in Newark, N.J., Wednesday, Sept. 25, 2013, during a ribbon-cutting ceremony for Newark charter schools. (AP Photo/Mel Evans)