The heat sweltered outside on a late August afternoon as Adelita Grijalva stood in the crowded dining room of Paloma Mexican Street Food restaurant in Avondale, Arizona, about 20 miles west of Phoenix. Grijalva had already won the Democratic primary and was headed to a special election for a U.S. House seat in Arizona. Though she had never held federal elected office—earlier this year, she’d resigned from the Pima County Board of Supervisors to run for Congress—voters knew her name. For 22