The very early months of the Democratic nominating race have been far from predictable. Kamala Harris shot up to the top tier pretty much overnight. Bernie Sanders revealed that he’d spent the past four years building a small-donor ATM. Amy Klobuchar taught us you could eat salad with a comb. And just last week, Sherrod Brown proved it is actually possible for a politician to resist the siren song of glowing press coverage trying to lure him into the race.