 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.