On the one hand, of course, there is Mr. Trump, who set up camp in the deep corners of the American psyche three years ago and has remained there ever since, a larger-than-life-presence for supporters and detractors alike, the invisible guest whose existence can ruin a holiday meal as quickly as your cousin can utter the word “Ukraine.”

On the other hand there is the vast field of bickering Democratic candidates, so many candidates that it can be hard to keep them straight, so many candidates that they seem at risk of canceling each other out and failing at the one job they are theoretically meant to do: win the election. Meanwhile, impeachment itself serves as nothing more than a Rorschach test of worry set to Robert’s Rules of Order.

“If they’re not going to get along, they need to keep quiet,” said Beverly Hall, 63, another Biden supporter at the Greenwood event. But beyond being happy about her candidate, she has watched and read a lot about the election, she said, and she does not feel great.

“This guy who’s on the commercials — Jim, what’s his name?” she said, referring to Tom Steyer. “I like what he’s saying. I like the issues he’s bringing up. But why are you spending $3 million on TV when you could be giving the money to Joe?”

Some people are suffering from general political angst. Others have specific qualms: a concern that their favorite candidate lacks that essential quality, electability; a worry that fellow Democrats will become disillusioned if their chosen candidate fails to get the nomination and will vote for a third-party candidate, or for Mr. Trump, or for no one at all — the “Bernie or Nobody” scenario.