If newly re-elected New Jersey Gov. Chris Christie runs for president in 2016, his ability to deal with the national scrutiny of his background and the deeply divided Republican Party will be key factors to the success of his possible candidacy, the authors of the new book "Double Down" told CNBC.
"Navigating the Republican Party, that's the biggest challenge not just for Chris Christie but for anybody," Mark Halperin said in a "Squawk Box" interview, promoting the book with co-author John Heilemann. "Christie needs to navigate the tea party and the big money people and bring them together."
In Tuesday's election, Christie easily won a second term by defeating Democratic challenger and state senator Barbara Buono.
(Read more: Christie wins big, tea party loses in Va. race)
"People think they know a lot about Chris Christie because he's gotten a lot of attention for a governor. The truth is there's been very little national scrutiny to the totality of his background," said Heilemann.
"He's going to get a lot more attention than he's ever gotten before, and we'll see how he stands up to that."
(Read more: Chris Christie could save the GOP)