Finally, the 2016 presidential contest starts today, and each candidate hopes to motivate as many voters as possible to caucus in one of Iowa's 1,774 precincts. It can be a challenge to get a large turnout in good weather, but forecasters are expecting potentially heavy snowfall across the state. Winter storm warnings are in effect in many counties, and Iowans in the northwest are under a blizzard warning until 4 a.m.