Since Reverend Wright is not running for office or a place on the Sunday morning gab fests, he can speak truth to power in a way that is forbidden to mainstream political candidates and pundits. Speaking truth to power does not mean that one is always right. Some of his pronouncements are off-base, but he does appear to be speaking from his heart.
Of course one's heart is not where most public political pronouncements come from. Most of these come from the word processors of fresh-faced communications graduates filtered through the mesh of endless focus groups. That way all genuine substance can carefully strained out before being released to the public.