Mitt Romney easily won the New Hampshire Republican presidential primary, leaving his opponents in disarray and taking a big step toward becoming his party's choice to run against President Barack Obama in November. Romney garnered 39 percent of the vote, a 16-percentage point advantage over his closest challenger, Texas congressman Ron Paul. The decisive victory in Tuesday's primary followed Romney's narrow win in last week's Iowa caucuses, giving him powerful momentum ahead of the crucial South Carolina primary on Jan. 21. A win there and in Florida 10 days later could make Romney all but unstoppable, according to a report of the Associated Press.