Driven by dissatisfaction with President Donald Trump, they could make a difference in a state that chooses its primary candidate via a caucus, which, unlike an open primary, attracts only the most motivated voters.
Candidates Cory Booker and Kamala Harris, who are black, are trying to rally more black voters. But so are Amy Klobuchar and other rivals. That's because even though African Americans make up only 2% of Iowa's population, they are expected to make up a larger share of the caucus turnout next February.
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