The DC Brief Twice A Week Making sense of what matters most in Washington. Sign Up By signing up you are agreeing to our Terms of Service and Privacy Policy . Tuesday night was a very good night to be a leftist in New York City. It was even a better night to be Zohran Mamdani Two prominent House Democrats lost their primaries to insurgent rivals while a third left-wing candidate defeated the Brooklyn Borough chief. All together, the results demonstrated the fragility of an Establishment