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O
n a Sunday evening in early October, dozens of people mingled in a backyard overlooking a canyon in the posh Turtle Rock neighborhood of Irvine for a local Democratic club fundraiser.
Irvine is the largest city in the 47th Congressional District, one of the House swing seats in California that could decide control of Congress in November. But on this balmy evening, conversation over wine and hors d’oeuvres drifted to the topic of the district’s second-largest city, just up the 405: Huntington Beach…