Watch Scott Run

So does Walker support an agreement on immigration or is he against it? He has a year to clear it all up.

Learning on the trail.

Photographer: Darren McCollester/Getty Images

Complexity, nuance or just old-fashioned inconsistency -- a governor or senator can get away with all those things. But as Scott Walker is learning fast, when politicians run for president, it's necessary to stick to the same, mind-numbingly dull script over and over again if they want to avoid those little flaps

To continue reading this article you must be a Bloomberg Professional Service Subscriber.