US President Barack Obama speaks with Helen F. Chavez at the grave of her husband Cesar Chavez during a tour of a memorial garden at the Chavez National Monument October 8, 2012 in Keene, California. Obama visited the memorial which honors Cesar E. Chavez, an American civil rights activist and labor leader, who helped found the National Farm Workers Association and died in 1993 while also campaigning in California. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/GettyImages)