President Obama shakes hands with Alex Caldwell, 8, of Houston as his father, the Rev. Kirbyjon Caldwell (right) watches during a Father's Day event in Washington on Monday, June 21, 2010. (AP Photo/Susan Walsh)

Photo by: Susan Walsh

President Obama shakes hands with Alex Caldwell, 8, of Houston as his father, the Rev. Kirbyjon Caldwell (right) watches during a Father's Day event in Washington on Monday, June 21, 2010. (AP Photo/Susan Walsh)