MANCHESTER, New Hampshire — For a brief moment, concerned looks crossed the faces of some Elizabeth Warren supporters gathered for her election night event in a cavernous building near the Manchester airport. There were no TVs visible to most of the crowd, a common feature for a struggling campaign that doesn’t want the audience to see bad news. There was no warmup speaker. At 8:20 p.m., facing a fourth-place finish in New Hampshire after a third-place showing a week ago in Iowa, Warren walked onstage without fanfare.

She began by acknowledging that Bernie Sanders and Pete Buttigieg “had strong nights.” Then, she congratulated Amy Klobuchar for her surprise showing. And then, she said what caused those concerned looks.