He isn't announcing anything yet, but Newark Mayor Cory Booker (D) argued Monday that Republican Gov. Chris Christie can be beaten in 2013. 

"“We think to any Democrat Christie is vulnerable, as it should be, because there's a lot of issues in the state he's not falling in line with, from women's issues, environmental issues, from really going in a balanced way," Booker told CNN's "Starting Point."

The second-term mayor has said he will make a decision on a bid in the next two weeks. Over the weekend, New Jersey Democratic Party Chairman John Wisniewski announced that he would not run against Christie.

Polls give Christie, buoyed by his widely praised response to Superstorm Sandy, a very comfortable lead over all his potential rivals. A recent survey from Rutgers University has the governor leading Booker, his most formidable foe, by 53 to 34 percent.

Booker is also considering running for Senate in 2014, when Sen. Frank Lautenberg (D) is up for reelection. The 88-year-old senator has said he intends to run for a sixth term but has not made definite plans.