President Donald Trump has slipped underwater with one of the most important blocs in his political coalition, according to a new CNN poll conducted by SSRS, which found his net approval among white working-class voters turned negative for the first time in his second term. The survey, conducted March 26 to March 30 among 1,201 adults, showed Trump at 49% approval and 50% disapproval with white non-college voters, a narrow but politically notable reversal for a group that helped drive his return to the White House. The shift matters because white working-class voters have long been central to Trump's electoral...