President Obama walks up the steps of Air Force One at Andrews Air Force Base Md., Monday, Aug. 16, 2010. Mr. Obama is embarking on a three-day tour to raise money for Democrats, beginning in Wisconsin where he will visit ZBB Energy Corp, to underscore what he said was his lasting commitment to a clean energy future.

Photo by: Susan Walsh

President Obama walks up the steps of Air Force One at Andrews Air Force Base Md., Monday, Aug. 16, 2010. Mr. Obama is embarking on a three-day tour to raise money for Democrats, beginning in Wisconsin where he will visit ZBB Energy Corp, to underscore what he said was his lasting commitment to a clean energy future.