President Obama walks with Cesar Chavez's widow, Helen F. Chavez (left), and Dolores Huerta, co-founder of the United Farm Workers, as they tour the Cesar E. Chavez National Monument Memorial Garden in Keene, Calif., on Monday. (Associated Press)

Photo by: Carolyn Kaster

President Obama walks with Cesar Chavez's widow, Helen F. Chavez (left), and Dolores Huerta, co-founder of the United Farm Workers, as they tour the Cesar E. Chavez National Monument Memorial Garden in Keene, Calif., on Monday. (Associated Press)