In Mr. Trump, they see someone at last willing to acknowledge the needs of the white working class. “I feel that we’re getting left out,” Mrs. Lux said. “There’s more than Black Lives Matter. What about us?”

Mr. Peele was still unloading signs when Marcos Quevedo pulled up. He, too, wanted a Trump sign. Mr. Quevedo, 45, is the president of Sleepdreams Diagnostics, which also has office space in the cigar factory. The aftermath of the Great Recession cost Mr. Quevedo his managerial position with a sleep diagnosis company and contributed to the collapse of his marriage. “Corporate America got a little ruthless,” is how he puts it.

Mr. Quevedo, a registered Democrat who was raised in West Tampa by parents who fled Cuba, says he is troubled by what he sees as thuggishness and racially charged language at Trump campaign rallies. But such is his frustration with both parties, and his desperation to shake up Washington, that he is willing to overlook the ugliness. “I’m turning my cheek to the David Duke comments,” he said.

That evening, Trump volunteers began arriving for several hours of phone banking.

Deloris Owens, 49, is one of the first to arrive. This is the first time she has volunteered for a political campaign. After 2008 she was laid off by Verizon, where she had worked as a call center supervisor. Then she and her husband lost their home in Brandon to foreclosure, as did many of their neighbors. Mrs. Owens, who describes herself as “in the middle” politically, said she voted for Mr. Obama in 2012.

Emma Aquino, 51, arrives moments later with her own tale of 2008 woe. Her home in Utah, she said, lost 50 percent of its value, and when an accident left her unable to work, she risked losing the house altogether. The most her bank would do was reduce her interest rate, but only at the cost of extending her mortgage to 40 years from 20.

To her, the mortgage meltdown perfectly encapsulates what she views as the corrupt bargain that rules the nation’s capital — politicians from both parties getting in bed with big corporations and their lobbyists to rig the game against average Americans. “The banks,” she says, her voice rising with indignation. “The government supported the banks.”