Joe Biden put Republican voters who supported President Trump four years ago front and center on Night One of the Democratic convention, a tactic Republican operatives said could help move fence-saddling Republicans into Biden’s corner.

In a series of home-made cellphone videos, rank-and-file voters, who identified themselves as Republicans who backed Trump in 2016, said they regret their choice and plan to support Biden this November. The videos bolstered the theme of unity that tied together the first session of Biden’s nominating convention Monday evening. Republican operatives concede that it might be an effective way to make GOP voters disappointed in Trump feel comfortable supporting the former vice president.