MIAMI — Fighting for Florida and beyond, Hillary Clinton and Bernie Sanders tangled in an intense debate Wednesday night over who’s the true friend of American Hispanics, trading accusations over guest worker programs “akin to slavery” and the embracing of “vigilantes” against immigrants. They had even worse things to say about Republican front-runner Donald Trump. Facing off just six days before Florida gives its verdict on the presidential race, Clinton faulted Sanders for repeatedly voting against a 2007 comprehensive immigration reform bill. He faulted her for opposing a 2007 effort to let people who were in the country illegally obtain a driver’s...