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MANCHESTER, NH - APRIL 15: New Jersey Governor Chris Christie (L) and his wife Mary Pat Foster greet diners at Chez Vachon April 15, 2015 in Manchester, New Hampshire. The governor is on a four day swing through the first in the nation primary state as he explores a run for the Republican nomination for president.
MANCHESTER, NH - APRIL 15: New Jersey Governor Chris Christie (L) and his wife Mary Pat Foster greet diners at Chez Vachon April 15, 2015 in Manchester, New Hampshire. The governor is on a four day swing through the first in the nation primary state as he explores a run for the Republican nomination for president.

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Gov. Chris Christie launches presidential comeback tour in New Hampshire. CNN's Joe Johns reports.

In New Hampshire, Christie stabs at Clinton and Bush

Gov. Chris Christie launches presidential comeback tour in New Hampshire. CNN's Joe Johns reports.