Democratic presidential candidates are hoping to woo Iowa voters as the the state holds the first nominating contest of the 2020 election on Feb. 3.
Scenes from the 2020 Iowa Caucuses

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A volunteer holds a presidential preference card before the start of a Democratic caucus at Hoover High School, Feb. 3, 2020, in Des Moines, Iowa.

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Residents wait to enter an Iowa Democratic caucus at Hoover High School, Feb. 3, 2020, in Des Moines, Iowa.