This is the upstart campaign of Pete Buttigieg , the 37-year-old Indiana mayor who has suddenly become one of the hottest names in the Democrats' presidential primary season. Yet there is an increasing urgency, inside and outside the campaign, that his moment may pass if he doesn't take swift action to build a national organization capable of harnessing the energy he'll need to sustain his surge in the nine months or so before the first votes are cast.