No other event on the political calendar boasts the storied history of the New Hampshire primary: antiwar crusader Eugene McCarthy stunning Lyndon Johnson in 1968 with an epic showing; Ronald Reagan stealing a line from an old Spencer Tracy movie in 1980 as he shouted, “I paid for this microphone”; and Bill Clinton promising voters in 1992 that, if they rescued his scandal-plagued campaign, he would remember them “until the last dog dies.”New Hampshire may again be in the crosshairs of history o