PoliticsPowered by older voters, Mitt Romney won an unmistakable nod of approval from New Hampshire in the GOP presidential sweepstakes. In a state with a history of primary surprises, the former Massachusetts governor breathed a sigh of relief when the votes were counted. He won 40 percent, comfortably higher than his 31.5 percent showing in 2008 when he was runner-up to John McCain. Fifty-six percent of GOP primary voters were over 50 years old, and 4 in 10 of those …