The new mover and shaker in the California governor’s race. Photo: Yalonda M. James/San Francisco Chronicle/Getty Images Like nature itself, politics abhors a vacuum. So the hole in the California Democratic gubernatorial field caused by front-runner Eric Swalwell ’s sudden, scandal-driven withdrawal from the race (and resignation from Congress) created a whole new dynamic. And now, there’s growing evidence that Xavier Becerra , the former Health and Human Services secretary and California