When then-President Obama awarded California labor leader Dolores Huerta the Presidential Medal of Freedom — the nation’s highest civilian honor — one person was notably absent from the ceremony in the White House’s East Room: Julie Chavez Rodriguez. Huerta has known Chavez Rodriguez, the granddaughter of the legendary Cesar Chavez, who co-founded the United Farm Workers union with Huerta, since she was an infant. Chavez Rodriguez was working in the Obama administration at the time, but those who know her said her absence from the ceremony was not the least bit surprising. “I couldn’t find Julie because she was busy...