Late last month Rivera told his radio audience he was "truly contemplating" a run in 2014.

“I mention this only briefly, fasten your seat belt,” Rivera said. “I mentioned this only briefly to my wife ... but I am and I’ve been in touch with some people in the Republican Party in New Jersey. I am truly contemplating running for Senate against Frank Lautenberg or Cory Booker.”

“I’m not going to drill this out, because obviously I’ve got commitments to Fox and to here at the radio program and I’m really having a great time,” Rivera continued. “But I figure at my age, if I’m going to do it I’ve got to do it. And there doesn’t seem to be any Republicans ready to work against or run against Cory Booker, the popular Newark mayor.”

Sen. Frank Lautenberg (D-N.J.), who is 89, has not said yet whether he will seek another term, but Newark Mayor Cory Booker has indicated that he plans to seek the Democratic nomination. The Monmouth poll found that in a hypothetical Democratic primary, 40 percent would choose Booker and 25 percent would back Lautenberg.