Unmoored from power and panicked by Trump’s momentum, the left lashes out—from Congress to campus to the street—with rage born of fear and fading influence. Across the political left, from orthodox Democrats to Antifa in the streets, the opposition to Trump has lost its collective mind. The House minority leader and now self-styled tough guy, Rep. Hakeem Jeffries, poses with a baseball bat to show how dangerous he is in opposing Trump’s budget bill. Jeffries harangued Congress for eight hours; Sen. Cory Booker went on for 25—both to no effect. Bernie Sanders and AOC hit the rally trail in private...