Oh, come now ... the Africa trip may have had political objectives? From Yahoo / USAToday:

President Bush's five-nation trip to Africa last week was part of his subtle courtship of black Americans, a political constituency seldom wooed by Republican presidents ...

... The president's political strategists believe the trip will ease some of the mistrust black Americans have toward Bush. A USA TODAY/CNN/Gallup Poll taken June 27-29 found 31% of blacks approve of the job Bush is doing.