President Bush, left, shakes hands with DaimlerChrysler President and Chief Executive Officer Tom LaSorda, during a demonstration of Alternative Fuel Vehicles, Monday, March 26, 2007, on the South Lawn of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)
President Bush, third from right, stands with auto company executives, during a demonstration of Alternative Fuel Vehicles, Monday, March 26, 2007, on the South Lawn of the White House in Washington. From left are, Ford Motor Company President and Chief Executive Alan Mullay; General Motors Chairman and Chief Executive Officer Rick Wagoner; the president; CEO DaimlerChrysler President and Chief Executive Officer Tom LaSorda; and Transportation Secretary Mary Peters. (AP Photo/Pablo Martinez Monsivais)
President Bush, foreground, left, plugs a power cord into a Ford Vehicle as Ford Motor Company President and Chief Executive Officer Alan Mullay, right, looks on during a demonstration of Alternative Fuel Vehicles on the South Lawn of the White House in Washington, Monday, March 26, 2007. Behind the president is Energy Secretary Samuel Bodman, rear, left, and Vice President Dick Cheney, rear, right. (AP Photo/Pablo Martinez Monsivais)
Energy Secretary Samuel Bodman, rear, looks on as President Bush plugs a power cord into a Ford Vehicle during a demonstration of Alternative Fuel Vehicles, Monday, March 26, 2007, on the South Lawn of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)
Vice President Dick Cheney, right, and Energy Secretary Samuel Bodman, left, smile as they watch President Bush, center, during a demonstration of Alternative Fuel Vehicles, Monday, March 26, 2007, on the South Lawn of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)