US Representative Stephen F. Lynch, who has been leaning heavily on his background as a former ironworker as he runs for US Senate, is trying to beef up his policy credentials with a series of new videos in which he discusses his views on issues.

In the nine videos, posted on Lynch’s campaign website, the South Boston Democrat speaks about a range of issues — including some, such as lesbian, gay, bisexual, and transgender rights, that have not been part of his traditional portfolio.