With a win in New Hampshire, a maybe-win in Iowa last week, and a month-long surge into second place nationally, Sen. Bernie Sanders, I-Vt., is now in strong position to win the Democratic Party’s presidential nomination. It’s been a long road for the curmudgeonly man from Vermont, who spent years toiling on the fringes of official Washington. Of all things, the event that ultimately launched him into the Democratic Party’s mainstream turned out to be a binary 2016 primary contest with Hillary Clinton, a match-up in which the contrast ultimately benefited him more than her.So, here we are, in...