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President Bush arrives at Texas State Technical College Airport, Sunday, May 4, 2008, in Waco, Texas

President Bush walks toward Air Force One at Texas State Technical College Airport, Sunday, May 4, 2008, in Waco, Texas.

President Bush waves while leaving Texas State Technical College Airport, Sunday, May 4, 2008, in Waco, Texas. Bush spent the weekend at his ranch outside of Crawford, Texas.

U.S. President George W. Bush boards Air Force One at Texas State Technical College Airport in Waco, Texas, May 4, 2008.

President Bush, left, walks on the flightline with Buddy Shannon, right, after presenting him with the President's Volunteer Service Award at McConnell AFB, in Wichita, Kan., Sunday, May 4, 2008.

President Bush, left, and Buddy Shannon wave to Shannon's family after he was presented with the President's Volunteer Service Award at McConnell Air Force Base in Wichita, Kan., Sunday, May 4, 2008.

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President Bush waves to the crowd as he is introduced during Greensburg High School graduation in Greensburg, Kan., Sunday, May 4, 2008.

President Bush delivers the commencement address at Greensburg High School, Sunday, May 4, 2008, in Greensburg, Kan.

U.S. President George W. Bush takes part in a graduation ceremony at Greensburg High School in Greensburg, Kansas, May 4, 2008. A Category 5 tornado devastated the town one year ago.

President Bush hands a high school diploma to Kasha Marie Charlton during Greensburg High School graduation in Greensburg, Kan., Sunday, May 4, 2008.

President Bush watches the Class of 2008 throw their caps in the air during Greensburg High School graduation in Greensburg, Kan., Sunday, May 4, 2008.