Gerry Rojas, a 40-year-old porter at the Las Vegas airport, says the president’s response to the pandemic will energize more voters to support Mr. Biden. Mr. Rojas, an organizer for Culinary Union Local 226, which represents 60,000 hospitality workers, said when he went door to door in 2016 it was difficult to get people engaged about the election because they didn’t like their choices. This year, he said, more people are home when he knocks, and he is finding many people support Mr. Biden.

“They’re like, ‘No, we’re ready to vote this year.’ Because they’re angry because the president didn’t manage this pandemic the right way,” he said.

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A large part of that is because of the support of the Culinary Union, which was canvassing in person even when the Biden campaign was only doing so online. At the height of the pandemic, 98% of union members were out of work with casinos closed. More than six months later, half of those workers still aren’t back at work, estimates D. Taylor, the president of Unite Here, Culinary’s national affiliate. Mr. Taylor said more than 200 union members are canvassing in Las Vegas and Reno for Mr. Biden, the largest organizing effort the union has ever had.