It's just the first Republican primary. But a convincing win in New Hampshire would give Mitt Romney considerable momentum in his quest toward the GOP nomination.
NPR has declared Romney the winner in New Hampshire. Initial precinct returns showed him well ahead of his next-closest competitors, Texas Rep. Ron Paul and former Utah Gov. Jon Huntsman.
If Romney's final margin is more than 20 percent, it would erase many doubts about his ultimate chances, says Charlie Arlinghaus, who directs the Josiah Bartlett Center for Public Policy, a free-market think tank in Concord, N.H.
"Romney's greatest strength is the inevitability argument," Arlinghaus says. "Expectations had declined to the point where people were wondering if Romney was in trouble. But if he finishes over 40 percent, he's going to be hard to beat."