South Bend, Ind., Mayor Pete Buttigieg (second from right) campaigns at a house party in suburban Des Moines on Feb. 9, soon after announcing he was considering a run for the Democratic presidential nomination. Two months later, Buttigieg drew a crowd of nearly 1,600 in Des Moines.

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South Bend, Ind., Mayor Pete Buttigieg (second from right) campaigns at a house party in suburban Des Moines on Feb. 9, soon after announcing he was considering a run for the Democratic presidential nomination. Two months later, Buttigieg drew a crowd of nearly 1,600 in Des Moines.