President Trump early Sunday tweeted that the race for Democratic National Committee (DNC) chairman was “rigged.” “Bernie's guy, like Bernie himself, never had a chance. Clinton demanded Perez!” Trump added. Former Labor Secretary Tom Perez on Saturday defeated Rep. Keith Ellison (D-Minn.) to become the next DNC chairman in a win for centrist Democrats. The race, which split along establishment-grassroots lines, in many ways mirrored the divisive 2016 presidential primary between Sen. Bernie Sanders (I-Vt.) and Hillary Clinton. Sanders and many of his allies backed Ellison, the first-ever Muslim elected to Congress and a star on the left. “Congratulations to...