President Biden, prodded by Democrats to confront former President Donald J. Trump head-on about Mr. Trump’s criminal conviction in his New York hush-money case, heeded those calls on Monday night during a big-dollar fund-raiser in Connecticut for his re-election campaign and for the party. Mr. Biden railed against his rival at a reception in Greenwich, telling a group of supporters who included Connecticut’s governor and its two sitting U.S. senators that the campaign had entered “...