If, as it is being reported, Scott Walker is dropping out of the race, it is hard to overstate how much the move blindsided some of his staff. Just a few hours ago, his Super PAC wanted me to write about a new ad scheduled to start airing tomorrow, and some of his consultants had wanted to line up an interview later in the week. If Walker’s decision feels like a surprise, it is because it is, even to some of his own team.