Democrats broke into open warfare Thursday over Speaker Nancy Pelosi’s surrender to the Senate’s emergency border aid package, with the caucus’s long-simmering divide between progressives and centrists playing out in dramatic fashion on the House floor. Some lawmakers even resorted to public name-calling, with progressive leader Rep. Mark Pocan (D-Wis.) accusing moderate Democrats of favoring child abuse — an exchange on Twitter that prompted a pair of freshmen centrists to confront him directly on the floor, with other lawmakers looking on in shock... ….“I think the Problem Solvers Caucus is emerging to be this tea party within our own Democratic...