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John Olsen, who is commonly known as Dr. Vote, from Ankeny, shows off various caucus pins on his vest at an Ankeny Area Democrats event at the United Auto Workers Local 450 union in Des Moines, Iowa, on Thursday, Jan. 14, 2016. (Credit: Al Drago/AP Images)

John Olsen, who is commonly known as Dr. Vote, from Ankeny, shows off various caucus pins on his vest at an Ankeny Area Democrats event at the United Auto Workers Local 450 union in Des Moines, Iowa, on Thursday, Jan. 14, 2016. (Credit: Al Drago/AP Images)