With a Great Stock market…Democrats focus those who aren’t part of it…

At an event in Knoxville on Sunday, for instance, Mr. Buttigieg, the mayor of South Bend, Ind., said that top-line economic numbers increasingly failed to reflect the experience of many Americans. “It’s nice to see that the Dow Jones is doing well,” he told the crowd, who had packed into a roller skating rink to see him. “But more and more Americans find that we’re fighting like hell just to hold onto what we’ve got.”

During multiple events, in Iowa and New Hampshire, former Vice President Joseph R. Biden Jr. rejected the idea that the strong economy was lifting everyone. He took aim in particular at one of Mr. Trump’s greatest wells of support: white working-class Americans, who were once a bedrock of the Democratic Party but who are now helping Mr. Trump remain competitive in battleground states like Michigan, Wisconsin and Pennsylvania.

“An awful lot of people — middle-class folks — are in real trouble, and they’re not at all certain about their future,” Mr. Biden said in Fairfield, Iowa, on Saturday. “So the idea that everybody’s doing well is just simply not true. The very, very wealthy are doing very, very well, but the rest are scraping along.”

At an event on Sunday in Peterborough, N.H., he acknowledged that the economy was “growing” and unemployment was “incredibly low.” But, he said, “There’s no rational distribution of the growth in terms of increases in income and other things.”

One consistent theme at campaign events is that wages are not rising enough to offset the increasing costs of living, including for health care and education. Another is that with a strong economy, workers should be sharing more of the gains.

“Are your wages going up?” a volunteer for Senator Elizabeth Warren’s campaign asked the audience as she introduced the candidate in Clarinda, a small town in southwestern Iowa.

When she took the stage herself, Ms. Warren of Massachusetts argued that the economic recovery had failed to touch the most marginalized communities or rural areas.