The latest survey found that nearly two in five Iowa Democratic caucus-goers said their minds hadn't been made up yet.
Pete Buttigieg, the former mayor of South Bend, Indiana, came in second place at 18 percent. Former Vice President Joe Biden, who leads the national polling average, came in third place at 17 percent, followed by Senator Elizabeth Warren at 15 percent.
There is a substantial imbalance in the gender-composition of Sanders supporters in Iowa, more uneven than for any other candidate. While 34 percent of male Democrats support him in Iowa, he is backed by just 17 percent of female Democrats in the state, the largest gender spread in the Iowa race. He is also the only Democratic candidate in Iowa to be preferred by men by more than five percentage points.
Warren could stand to benefit from siphoning off support from Sanders, for example. The poll found that she was the second choice for 44 percent of Sanders supporters in Iowa, the highest correlation between any two candidates in the race.
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