Former US first ladies Barbara Bush (L) and Laura Bush watch as their husbands, former US presidents George H.W. Bush and George W. Bush, attend the ceremonial first pitch throwing prior to the start of Game 4 of Major League Baseball's World Series between the San Francisco Giants and the Texas Rangers, in Arlington, Texas, Oct 31, 2010. [Photo/Agencies]

Texas Rangers fans wearing George W. and Laura Bush masks wait for the start of Game 4 of Major League Baseball's World Series between the Rangers and the San Francisco Giants in Arlington, Texas, Oct 31, 2010. [Photo/Agencies]