Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y., right, laughs as she is introduced by her daughter, Chelsea, at a Mothers Day fundraiser in New York Saturday, May 10, 2008. (AP Photo/Elise Amendola)
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Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks while campaigning at Summit High School in Bend, Ore., Saturday, May 10, 2008.(AP Photo/Don Ryan)
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Democratic presidential hopeful, Sen. Barack Obama, D-Ill., wears protective goggles as he tours PV Powered Plant, a manufacturer of photovoltaic inverters, in Bend, Ore., Saturday, May 10, 2008. (AP Photo/Jae C. Hong)
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Democratic presidential hopeful, Sen. Barack Obama, D-Ill., center, and Rep. Earl Blumenauer, D-Ore., right, tour PV Powered Plant, a manufacturer of photovoltaic inverters, in Bend, Ore., Saturday, May 10, 2008. (AP Photo/Jae C. Hong)
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Democratic presidential hopeful, Sen. Barack Obama, D-Ill., shakes hands with supporters as he arrives at a town hall-style meeting in Bend, Ore., Saturday, May 10, 2008. (AP Photo/Jae C. Hong)
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Democratic presidential hopeful, Sen. Barack Obama, D-Ill., speaks at a town hall-style meeting in Bend, Ore., Saturday, May 10, 2008. (AP Photo/Jae C. Hong)
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Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y., is hugged at a Mothers Day fundraiser in New York Saturday, May 10, 2008. (AP Photo/Elise Amendola)
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Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y., speaks at a Mothers Day fundraiser in New York Saturday, May 10, 2008. (AP Photo/Elise Amendola)
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Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y., laughs as she is introduced by her daughter, Chelsea, far left, at a Mothers Day fundraiser in New York Saturday, May 10, 2008. Applauding at right is Rep. Charles Rangel, D-NY, and Rep. Nita Lowery, D-NY. (AP Photo/Elise Amendola)
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Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y., reacts as she takes the stage with her daughter, Chelsea at a Mothers Day fundraiser in New York Saturday, May 10, 2008. (AP Photo/Elise Amendola)
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