Democratic presidential candidate Pete Buttigieg, right, and his husband, Chasten Buttigieg, greet people at a campaign event in Hampton, N.H. (Elise Amendola / Associated Press)
Bernie Sanders, with wife Jane O’Meara Sanders, greets supporters at a caucus night rally in Des Moines. (Pablo Martinez Monsivais / Associated Press)
Elizabeth Warren hugs her grandchildren Atticus Mann Tyagi and Lavinia Tyagi before addressing supporters in Des Moines. (Chip Somodevilla / Getty Images)
Joe Biden with his wife, Jill Biden, at a caucus night rally in Des Moines. (Marcio Jose Sanchez / Associated Press)
Amy Klobuchar greets supporters at her caucus night rally in Des Moines. (Nati Harnik / Associated Press)
Troy Price, chairman of the Iowa Democratic Party, is surrounded by reporters after speaking about the technical issues that delayed the caucus results in Des Moines. (Joshua Lott/AFP )
Bernie Sanders supporters await results at a caucus watch party in Des Moines. (Kerem Yucel / AFP/Getty Images )
Observer David Soll of Rockford, Ill., talks to participants during the Democratic caucus at the Tri-State Independent Blind Society in Dubuque, Iowa. (Dave Kettering / Telegraph Herald)
A supporter for Andrew Yang waits before a Democratic caucus at Hoover High School in Des Moines. (Charlie Neibergall / Associated Press)
Caucusgoers check in at Hoover High School in Des Moines. (Charlie Neibergall / Associated Press)
A caucus gathering at Abraham Lincoln High School in Des Moines. (Jim Watson / AFP/Getty Images )
People caucusing for Pete Buttigieg begin to fill his section of the Knapp Center at Drake University in Des Moines. (Gene J. Puskar / Associated Press)
On caucus night in Iowa, Bernie Sanders supporters attend a caucus watch party in Washington, D.C. (Mario Tama / Getty Images)
Bernie Sanders supporters at their caucus precinct at Abraham Lincoln High School in Des Moines. (Jim Watson / AFP/Getty Images)
Joanne Smith of Chicago attends a Joe Biden rally in Des Moines. (Marcio Jose Sanchez / Associated Press)
Bernie Sanders supporters wait before a caucus night rally for their candidate in Des Moines. (Kerem Yucel / AFP/Getty Images )
Caucusgoers aligned with Joe Biden hold up their first votes at the Knapp Center at Drake University in Des Moines. (Gene J. Puskar / Associated Press)
Caucusgoers at Roosevelt High School in Des Moines. (Andrew Harnik / Associated Press)
Pete Buttigieg supporters gather at a caucus site at Roosevelt High School in Des Moines. (Andrew Harnik / Associated Press)
Caucusgoers at Roosevelt High in Des Moines. (Andrew Harnik / Associated Press)
A line at a Democratic caucus site at Hoover High School in Des Moines. (Charlie Neibergall / Associated Press)
Elizabeth Warren speaks Monday at Roosevelt High School, a caucus site in Des Moines. (Andrew Harnik / Associated Press)
Volunteers prepare an area in the Roosevelt High School gymnasium in Des Moines where supporters of Pete Buttigieg will rally while caucusing. (Chip Somodevilla / Getty Images)
Bernie Sanders precinct captain Clara Gilbert indicates the area where Sanders supporters should gather during the first alignment of caucusgoers at the Cedar Rapids Public Library. (Jim Slosiarek / Gazette)
Amy Pfeiffer prepares a flag in advance of a Buttigieg caucus night watch party at Drake University Bell Center in Des Moines. (Gary He / European Pressphoto Agency )
Volunteers prepare an area of the Roosevelt High School gym in Des Moines where Elizabeth Warren supporter will rally during caucusing. (Chip Somodevilla / Getty Images)
Workers prepare the stage for Amy Klobuchar’s caucus night rally at the Marriott hotel in Des Moines. (Scott Olson / Getty Images)
Joe Robinson vacuums before a caucus night gathering for Bernie Sanders at the Holiday Inn in Des Moines. (Joe Raedle /Getty Images)
Democratic presidential candidate Joe Biden speaks at a campaign stop at Hiatt Middle School in Des Moines. (Andrew Harnik / Associated Press)
Democratic presidential candidate Pete Buttigieg speaks at Lincoln High School during a Get Out the Caucus rally in Des Moines. (Win McNamee / Getty Images)
Democratic presidential candidate Tom Steyer makes a stop at Backpocket Brewing in Coralville, Iowa. (Joseph Cress / Associated Press)
Pete Buttigieg casts a shadow on the Iowa state flag as he speaks at a campaign event at Northwest Junior High in Coralville, Iowa. (Matt Rourke / Associated Press)
Supporters wait for the arrival of Joe Biden during a campaign event in Dubuque, Iowa. (Marcio Jose Sanchez / Associated Press)
Democratic presidential candidate Bernie Sanders with his wife, Jane O’Meara Sanders, speaks to supporters in Des Moines. (John Locher / Associated Press)
