PHOTOS: Barack Obama attends a townhall meeting today in Watertown, South Dakota. [View All]

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Democratic presidential hopeful Sen. Barack Obama, D-Ill., gets a hug from a baby as he greets supporters in Watertown, S.D., Friday, May 16, 2008. (AP Photo/Jae C. Hong)


Democratic presidential hopeful Sen. Barack Obama, D-Ill., center, shakes hands with supporters, in Watertown, S.D., Friday, May 16, 2008. (AP Photo/Jae C. Hong)


Democratic presidential hopeful Sen. Barack Obama, D-Ill., speaks at a town hall meeting in Watertown, S.D., Friday, May 16, 2008. (AP Photo/Jae C. Hong)


Blake Paulson, 10, listens during a town hall meeting with Democratic presidential hopeful Sen. Barack Obama, D-Ill., Friday, May 16, 2008, in Watertown, S.D. (AP Photo/Jae C. Hong)


Democratic presidential hopeful Sen. Barack Obama, D-Ill., right, speaks at a town hall meeting in Watertown, S.D., Friday, May 16, 2008. (AP Photo/Jae C. Hong)


Supporters listen during a town hall meeting with Democratic presidential hopeful Sen. Barack Obama, D-Ill., Friday, May 16, 2008, in Watertown, S.D. (AP Photo/Jae C. Hong)


Supporters listen during a town hall meeting with Democratic presidential hopeful Sen. Barack Obama, D-Ill.,Friday, May 16, 2008, in Watertown, S.D.
(AP Photo/Jae C. Hong)


A woman raises her hand to ask a question during Democratic presidential hopeful Sen. Barack Obama, D-Ill., right, town hall meeting in Watertown, S.D. (AP Photo/Jae C. Hong)


Democratic presidential hopeful Sen. Barack Obama, D-Ill., listens to a question during a news conference after a town hall meeting in Watertown, S.D., Friday, May 16, 2008. (AP Photo/Jae C. Hong)