“He is incredibly awesome at figuring out how much money we need to spend,” one Clinton adviser said of Mook. “But when you’re close to the margins, there’s not a lot of room to spare.” Mook bet on Kriegel as the professional political class griped. The decision to hold back on spending and trust his plan was a striking demonstration of discipline. He’d made his name as an organizer and yet essentially determined that organizing was a fool’s errand on the short timeline before the March 1 showdown with Sanders.