Bill Clinton's political muscle memory took him down a well-worn path Monday in New Hampshire: the rally in Nashua, the lunchtime mingle in Manchester and the afternoon town hall in Exeter. Like the snow flurries on one of the coldest days of winter so far, Clinton's Arkansas twang was so familiar in the hamlets of the Granite State that it seemed to signal that the time to pick a president is near again. Asked about the repeated assertions by Republican front-runner Donald Trump that Clinton's history of sexual indiscretions was "fair game" in the campaign, he demurred. "There's always a...