The difference being that Obama is the first black POTUS, where Stalin was not the first Russian head of state nor Ida Amin the first black head of state for Uganda. Not at all a racist comment. You played that card too fast.
Barry Hussein's primary characteristic is that he is a socialist anti-American freak.
Anyone who ignores that because of his skin colour is both racist and stupid.
To treat a person's skin colour (an un-chosen accident of birth) as his primary defining characteristic is the very definition of racism.
Ask Martin Luther King.