The Al Sharpton radio show always gets even stranger when radical Syracuse professor Boyce Watkins is a guest. (Last year, he suggested Limbaugh listeners and Fox watchers easily become violent .) On Monday, Professor Watkins told Sharpton that Herman Cain should run for president like Colin Powell, and never mind that Powell actually endorsed Obama in 2008. If he's like a Tea Partier, then Cain's a racist: What I will say though is that I hope he