Ann Romney is expected to play more of a traditional "first lady" role in tonight's address, while N.J. Gov. Chris Christie will likely throw some punches at the Obama administration. Getty Images hide caption

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New Jersey Gov. Chris Christie greets Republican presidential candidate Mitt Romney in Des Moines, Iowa, on Dec. 30, 2011. Evan Vucci/AP hide caption

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If he decides to enter the GOP presidential race, New Jersey Gov. Chris Christie could learn a few things from fellow Gov. Rick Perry's troubles on the campaign trail.

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