The mayor of a mid-sized Midwest city whose name no one could pronounce at the start of this year has come a long way in the Democratic primary. For a rising star in the party, vastly over-performing expectations in a crowded presidential field would easily be considered a victory in its own way. But there’s real reason to think Pete Buttigieg could yet win this nomination outright. One such rather plausible scenario is starting to develop right before our eyes. It starts, as these things so often do, in Iowa.