Biden framed his call to deliver as a test for American democracy. He drew comparisons to the 1930s — “another era when our democracy was tested,” then by the threat of fascism. He pointed to new threats: Donald Trump challenging the legitimacy of U.S. elections and China’s president, Xi Jinping, betting that “democracy cannot keep up with him.”

There is a historical factor, too. Since the Vietnam War and Watergate, Americans’ trust in their government has fallen. If Biden had succeeded, he could have helped reverse this trend.

But Covid, and the government’s response to it, did the opposite. Trust in the C.D.C. fell throughout the pandemic: from 69 percent in April 2020 to 44 percent in January, according to NBC News.

Distrust in government can turn into a vicious cycle. The government needs the public’s trust to get things done — like, say, a mass vaccination campaign. Without that support, government efforts will be less successful. And as the government is less successful, the public will lose more faith in it.