Mr. Morris is one of a small subset of voters who supported Mr. Obama in 2008 and have now embraced Mr. Trump, attracted by his vow to shake up the political status quo and restore lost jobs. A CBS News poll conducted last month found that 7 percent of likely voters who supported Mr. Obama in 2012 now back Mr. Trump, a ray of hope for a candidate who remains behind in most polls and has alienated many centrist voters.

Interviews with Mr. Morris and more than a dozen others show a common theme: The message of change that inspired them to vote for Mr. Obama is now embodied by Mr. Trump, whom they see as a brash outsider unconnected with Washington bureaucrats and the big-money donors funding Democratic and Republican candidates.

Many of those interviewed said they felt duped by the president and frustrated by their personal circumstances. They said Mr. Obama had not done enough to create jobs, unfairly pushed through the Affordable Care Act, and damaged the international reputation of the United States with his handling of foreign affairs. Some also complained that the first black president had bungled his response to racially charged killings.