Sen. Bernie Sanders on Monday endorsed Democrat Randy Villegas, a 31-year-old school board trustee and auto shop owner, in a hotly contested battle in California to take on one of the GOP’s most vulnerable House members. Villegas and Jasmeet Bains, a doctor and moderate member of the California state Assembly, are both competing in the all-party primary for Republican Rep. David Valadao’s seat. Villegas has centered his campaign around economic populism and is affiliated with the progressive