- Republican presidential debate took place Saturday in New Hampshire
- Tara Setmayer: Chris Christie had scorched earth attack plan for Marco Rubio
Tara Setmayer is former communications director for Rep. Dana Rohrabacher, R-California, and a CNN political commentator. Follow her on Twitter @tarasetmayer. The opinions expressed in this commentary are solely those of the author.
(CNN)After a 10th place finish in Iowa and polling in single digits nationally, Chris Christie's presidential ambitions hinge on his performance in New Hampshire. And he knows it. Christie has invested significant time and money in New Hampshire (much to the chagrin of his constituents in New Jersey, where his approval rating has fallen to close to an all-time low of 31%).