How Philadelphia’s Democratic primary tests the bounds of US progressivism

On Tuesday, voters in Pennsylvania’s third congressional district — which encompasses much of Philadelphia’s urban core — will decide what kind of progressive champion they want representing them in the United States House of Representatives. Four candidates are vying for the Democratic nomination in Tuesday’s primary. They include state Representative Chris Rabb, state Senator Sharif Street, pediatric surgeon Ala Stanford and lawyer Shaun Griffith. …