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Mr. Romney traveled to New Hampshire on Monday, where he walked in a couple of Fourth of July parades, including one that also featured Mr. Huntsman, who spent part of his day at a backyard barbecue.

Mrs. Bachmann, who has seen her stock jump in recent polls, spent part of the weekend shaking hands in Iowa diners and strolling through a bustling farmers market as she tried to capitalize on her early popularity in the state that kicks off the presidential campaign season.