Volunteers for Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg, thank supporters as they wait in lines that spanned several blocks before the start of a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg takes the stage for a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg greets attendants following a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg greets attendants following a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Suzanne McKee waves to friends following a town hall led by Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. McKee says she was a republican prior to Buttigieg's candidacy and has since become a supporter. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg greets attendants following a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg greets attendants following a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg greets attendants following a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg greets attendants following a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Groups gather for the town hall for Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Thousands gather for the town hall for Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 20120. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Thousands gather for the town hall for Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg takes the stage for a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg takes the stage for a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Thousands gather for the town hall for Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.

Groups in the thousands wait to enter the town hall for Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg, at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. Lines spanned several blocks. REUTERS/Amanda Voisard.

Democratic presidential candidate former South Bend, Indiana mayor Pete Buttigieg speaks during a town hall at Washington-Liberty High School on Sunday in Arlington, Virginia, U.S., February 23, 2020. REUTERS/Amanda Voisard.