His pronouncement Tuesday at a school in central New Jersey drew shouts, gasps and some boos.
But his love of the Cowboys is no secret. In 2010, the then-rookie governor proclaimed his favorite sports teams to be the Cowboys, the New York Mets, the New York Knicks and the New York Rangers.
Christie says those are teams he grew up rooting for.
The governor, now running for re-election, joked that being a Cowboys fan "is not the smartest thing for the governor of New Jersey to be."
The Cowboys are hated division rivals of both the Giants and the Philadelphia Eagles, which also have a big New Jersey fan base.