"At a certain point in our lives we are left only with our close relationships and our clear recollections." So begins Thumper: The Memoirs of the Honourable Donald S. Macdonald. An early supporter of Pierre Trudeau for the Liberal Party leadership, Donald Macdonald has had a career in public life spanning four decades that included posts as House leader, minister of national defence, minister of energy, and minister of finance. He chaired the landmark Royal Commission on the Economic Union and Development Prospects for Canada, which led to free trade between Canada and the United States, and...