The union's weekend summit attracted eight of the top Democratic candidates. On Saturday they included former Rep. Beto O'Rourke, Sen. Amy Klobuchar and South Bend, Ind. Mayor Pete Buttigieg.
The summit had the candidates bringing their pro-union message to the 2 million members of that group.
The goal was to discuss a variety of issues impacting workers in America.
Buttigieg - nicknamed Mayor Pete - told Eyewitness News he'd like to see more assistance for workers across the country.
"My message to union leaders is help is on the way," Buttigieg said. "I support not just a higher minimum wage, but more ability to unionize."
"In fact I'd like to see us double unionization rates in the country. Because there are so many workers right now who are not protected."