A year ago, Hung Cao was a political ingenue without campaign experience or name recognition when he surprised a crowded GOP primary field by winning the nomination for Virginia’s 10th Congressional District. The retired U.S. Navy captain’s reward was to face incumbent Democratic Rep. Jennifer Wexton in a congressional district President Joe Biden won by a whopping 18 percentage points in 2020. Cao, a Vietnamese refugee who spent part of his childhood in West Africa, didn’t win, but he made it closer than anyone, including Wexton, expected. Cao, left, running for Senate in Virginia, serves attendees at a South Asian...