Top Republicans on Monday seized on House Democratic Leader Hakeem Jeffries’ endorsement of Zohran Mamdani for mayor of New York, casting the self-described democratic socialist as the new face of the Democratic Party ahead of next year’s midterm elections. House Speaker Mike Johnson, R-La., called Jeffries’ endorsement a “seismic shift in politics.” “We saw our clearest sign yet that this radical insurgent movement in the Democrat Party is succeeding, and they are ending what has always been known as the Democrat Party in America,” Johnson told reporters in the Capitol. “After a monthslong pressure campaign from the far left, House...