"I actually slapped on a pair of work boots for 18 years," Mr. Lynch said. "I was an ironworker. I think I know what a lot of people are going through right now. I know what it's like to stand in an unemployment line and struggle."
Mr. Lynch, who also visited Worcester and planned to hold a rally at the ironworkers' union hall in South Boston, said he would join Mr. Markey in supporting a deal to keep outside groups from spending money on political ads in the campaign.