Canada's most conservative prime minister? It's not who you think

The following is adapted from a recent speech by Ottawa author Bob Plamondon to the Albany Club. It’s based on Plamondon’s latest book, The Shawinigan Fox: How Jean Chrétien Defied the Elites and Reshaped Canada.
Sir John A. Macdonald, Robert Borden, R.B. Bennett, John Diefenbaker, Brian Mulroney and Stephen Harper were leaders of majority Conservative governments who all left their mark on our country.
But who was the biggest “small-c” conservative prime minister?