Plamondon was also one of the more pro-labour members of the Tory caucus. In 1985, he promoted a partnership between the federal and Quebec governments and the Quebec Federation of Labour's Solidarity Fund. Two years later, he stood with striking letter carriers in Sorel and criticized his own government's decision to approve replacement workers. He was prominent among a group of Quebec Tory MPs who tried to reduce the party's reliance on corporate donations. Ricardo López, a right-wing Quebec Tory MP, once suggested that Plamondon would be more suited to the social democratic New Democratic Party.