Democratic presidential candidate U.S. Sen. Barack Obama, left, D- Ill., smiles as Xernona Clayton, center, and Rev. Joseph Lowery, right, along with over 400 people in attendance at the Southern Christian Leadership Conference First Ladies Awards dinner sing Happy Birthday to him, Saturday, Aug. 4, 2007, in Atlanta. Obama was the keynote speaker at the awards dinner. (AP Photo/W.A.Harewood)
Democratic presidential candidate U.S. Sen. Barack Obama, D-Ill., speaks during the Southern Christian Leadership Conference First Ladies Awards dinner, Saturday, Aug. 4, 2007, in Atlanta. Obama was the keynote speaker at the dinner. (AP Photo/W.A.Harewood)
And, yesterday, at the Yearlykos Presidential Forum in Chicago...Democratic presidential candidates Sen. Barack Obama, D-Ill., right, talks about the influence of health care lobbyists as Sen. Hillary Rodham Clinton, D-N.Y., listens as they participate in the Yearly Kos Convention's Presidential Leadership Forum in Chicago, Saturday, Aug. 4, 2007. (AP Photo/Charles Rex Arbogast)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., talks about the influence of health care lobbyists in crafting health care legislation during the Yearly Kos Convention's Presidential Leadership Forum in Chicago, Saturday, Aug. 4, 2007. (AP Photo/Charles Rex Arbogast)
Democratic presidential candidates Barack Obama, D-Ill., left, and Rep. Denis Kucinich, D-Ohio, right participate in the Yearly Kos Convention's Presidential Leadership Forum in Chicago, Saturday, Aug. 4, 2007. (AP Photo/Charles Rex Arbogast)
Democratic presidential hopefuls Sen. Barack Obama, D-Ill., right, talks with Sen. Hillary Rodham Clinton, D-N.Y., after they participated in the Yearly Kos Convention's Presidential Leadership Forum in Chicago, Saturday, Aug. 4, 2007. (AP Photo/Charles Rex Arbogast)