Wealthy, well-educated voters helped carry Republican presidential front-runner Donald Trump to victory in this week’s East Coast primaries, a demographic the famously blunt-spoken billionaire had struggled to attract in the past. His sweep of Pennsylvania, Maryland, Delaware, Connecticut and Rhode Island on Tuesday included wins in some of the richest and best-educated counties in the country - like Fairfield County, Connecticut, and Newport County, Rhode Island - and added to victories in his more traditional strongholds of white working-class neighborhoods. Exit polls from Connecticut, Pennsylvania and Maryland showed Trump winning about half of Republican voters with college degrees, and over...