He's not the smartest, he is the most corrupt, his corruption and willingness to play dirty is what has afforded him his success. Like the robocalls against McCain in 2000 that said "What would you think if you knew McCain had fathered an illegitimate black child", that's dirty. If you have no honor or ethics and are willing to play dirty you have an edge, it doesn't mean your smarted than everyone else, it means your unethical and are willing to win at any cost using any tactic...
Irie