Bush endorses McCain (15 images)

U.S. President George W. Bush and Republican presumptive presidential nominee Sen. John McCain (R-AZ) wave as they depart after speaking to the media in the Rose Garden of the White House on March 5, 2008. Bush endorsed McCain's candidacy and pledged to support McCain during the campaign. (UPI Photo/Roger L. Wollenberg)

U.S. President George W. Bush and Republican presumptive presidential nominee Sen. John McCain (R-AZ) walk through the Colonnade on their way to speak to the media in the Rose Garden of the White House on March 5, 2008. Bush endorsed McCain's candidacy and pledged to support McCain during the campaign. (UPI Photo/Roger L. Wollenberg)

U.S. President George W. Bush (L) welcomes Republican presumptive presidential nominee Sen. John McCain (R-AZ) on the North Portico of the White House on March 5, 2008. Bush endorsed McCain's candidacy and pledged to support McCain during the campaign. (UPI Photo/Chip Somodevilla/POOL)

U.S. President George W. Bush (R) greets Republican presumptive presidential nominee Sen. John McCain (R-AZ) on the North Portico of the White House on March 5, 2008. Republican presidential candidate Mike Huckabee conceded the race last night after it was clear McCain would win the Texas and other primaries. (UPI Photo/Roger L. Wollenberg)