He was a lobbyist who represented one client who sought funds from the federal stimulus program and then another, a group backed by the Koch brothers, who opposed it. He was a political operative who once debated a cardboard cutout of the Democratic governor of New Hampshire to protest tax rates. And he was a congressional aide who was arrested after he brought a gun to work, then sued when he did not get it back. Perhaps not surprisingly, the campaign manager for Donald J. Trump’s unorthodox bid for president, Corey Lewandowski, a 40yearold New Hampshire resident, does not have...