22 JANUARY 2008 -- PHOENIX, AZ: Democratic presidential candidate HILLARY CLINTON speaks at a campaign rally in Phoenix Tuesday. Her campaign estimated that 10,000 people attended the rally. Clinton brought her campaign to Cesar Chavez High School in Phoenix, AZ, Tuesday night. Clinton used the appearance at the school to announce that the United Farm Workers Union, founded by the late Cesar Chavez, had endorsed her candidacy. Photo by Jack Kurtz