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FILE - In this Jan. 8, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney, listens as New Jersey Gov. Chris Christie speaks in Exeter, N.H. While Romney faults President Barack Obama for a weak American economy, Republican governors across the country are merrily trumpeting tales of business growth and falling employment. (AP Photo/Charles Dharapak, File)

FILE - In this Jan. 8, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney, listens as New Jersey Gov. Chris Christie speaks in Exeter, N.H. While Romney faults President Barack Obama for a weak American economy, Republican governors across the country are merrily trumpeting tales of business growth and falling employment. (AP Photo/Charles Dharapak, File)

Chris Christie