President Bush participates in a discussion on the National Parks Centennial Initiative at Shenandoah National Park in Luray, Va., Wednesday, Feb. 7, 2007. (AP Photo/Charles Dharapak)
U.S. President George W. Bush speaks at a roundtable event during his visit to the Shenandoah National Park in Luray, Virginia, February 7, 2007. Bush spoke about his 2008 Budget launch of the National Parks Centennial Initiative, part of the largest National Parks operations budget in history which includes the largest ever increase for park operations. REUTERS/Jason Reed (UNITED STATES)
President Bush, center, flanked by first lady Laura Bush, left, and Interior Secretary Dirk Kempthorne, takes part in a discussion on the National Parks Centennial Initiative at Shenandoah National Park in Luray, Va., Wednesday, Feb. 7, 2007. (AP Photo/Charles Dharapak)
President Bush, center, flanked by first lady Laura Bush, left, and Interior Secretary Dirk Kempthorne, makes a statement to reporters after attending a discussion on the National Parks Centennial Initiative at Shenandoah National Park in Luray, Va., Wednesday, Feb. 7, 2007. (AP Photo/Charles Dharapak)
U.S. President George W. Bush (R) and first lady Laura Bush walk from the Marine One helicopter upon return to the White House in Washington February 7, 2007. Bush flew to Luray, Virginia to make statement on National Parks Centennial Challenge and participate in roundtable discussion with Park Service employees. REUTERS/Yuri Gripas (UNITED STATES)