Democratic presidential hopeful, Sen. Barack Obama, D-Ill., greets the crowd with home care worker Pauline Beck of Alameda, Calif., who hosted Obama in a 'Walk a Day in My Shoes' program, as he arrives to speak at the Service Employees International Union Political Action Conference in Washington, Monday, Sept. 17, 2007. (AP Photo/Gerald Herbert)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., is greeted by the crowd as he arrives to speak at the Service Employees International Union Political Action Conference in Washington, Monday, Sept. 17, 2007. (AP Photo/Gerald Herbert)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks at the Service Employees International Union Political Action Conference in Washington, Monday, Sept. 17, 2007. (AP Photo/Gerald Herbert)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks at the Service Employees International Union Political Action Conference in Washington, Monday, Sept. 17, 2007. (AP Photo/Gerald Herbert)