Diefenbaker reinvigorated a moribund party system in Canada. Clark and Mulroney, two men who, as students, worked on and were inspired by his 1957 triumph, became the only other Progressive Conservatives to lead the party to election triumphs. Diefenbaker's biographer, Denis Smith, wrote of him, "In politics he had little more than two years of success in the midst of failure and frustration, but he retained a core of deeply committed loyalists to the end of his life and beyond. The federal Conservative Party that he had revived remained dominant in the prairie provinces for 25 years after he left the leadership." The Harper government, believing that Tory prime ministers have been given short shrift in the naming of Canadian places and institutions, named the former Ottawa City Hall, now a federal office building, the John G. Diefenbaker Building. It also gave Diefenbaker's name to a human rights award and an icebreaking vessel. Harper often invoked Diefenbaker's northern vision in his speeches.