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DES MOINES — Bernie Sanders’s presidential campaign sent a slew of celebrity surrogates to a “What Is a Caucus?” event at Drake University on Wednesday night.

Kal Pen, Justin Long, Gaby Hoffman, Ben Cohen, Jerry Greenfield, Jonathan Sadowski and Brendan Hines all came to voice their support for the candidate and give the one-minute pitch during a mock caucus.

Beforehand, Mr. Cohen and Mr. Greenfield, of Ben & Jerry’s ice cream, detailed the inspiration for their new flavor, Bernie’s Yearning, named for the Democratic presidential candidate who represents their home state of Vermont in the Senate.