For 10 points, name this Liberal Party PM who led Canada for most of the period from 1920 to 1948.
This politician's party accepted sketchy contributions from the Beauharnois power company in the leadup to an election that he lost anyway. He supported a social democratic welfare state in the book Industry and Society. This man's posthumously-published diaries reveal that he regularly conversed with his Irish terriers and the ghosts of dead relatives. In response to an economic downturn, his party used the slogan "[this man] or Chaos" to sweep out (*) R.B. Bennett's conservative government. This rival of Arthur Meighen became embroiled in a constitutional crisis when the Governor General dissolved Parliament in an affair named for this man and Governor General Byng. For 10 points, name this Liberal Party PM who led Canada for most of the period from 1920 to 1948.
This politician's party accepted sketchy contributions from the Beauharnois power company in the leadup to an election that he lost anyway.
William Lyon Mackenzie King