Presidential candidate Pete Buttigieg speaks during a campaign event leading up to the Iowa Caucuses at St. Ambrose University Friday, Jan. 31, 2020, in Davenport, Iowa. (John J. Kim/Chicago Tribune)
21 of 22 Democratic presidential candidates take the stage during the Iowa Democratic Wing Ding fundraising dinner at the Surf Ballroom Friday, Aug. 9, 2019, in Clear Lake, Iowa. (John J. Kim/Chicago Tribune)