Sanders needs to take a bold step or two to win more support from the "diversity coalition". Yesterday's debate question "Is Donald Trump a racist?" was an opportunity, but he chose to safely follow Clinton. Not quite a mark of a transformational leader.

Tactical, civility consideration (and fruitless semantics quibble potential) are worth thinking over, and Sanders had time for that. But verbal and body posturing matters as well, and it is worthwhile to practice to be a li-i-itle Trumpy. As it stands now, Trump can call anyone as he pleases while the Democratic opponents would not use a straight word on him.