Robert McKenzie
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Robert Trelford McKenzie (September 11, 1917–October 12, 1981) was a Vancouver, Canada-born professor of Politics and a psephologist.
[edit] Television
He was widely known in the UK for his televised reports on general election results as they were announced. He is popularly associated with the swingometer graphic used in such broadcasts. Additionally, he introduced and moderated the discussions in each episode of Milton Friedman's 1980 television series Free to Choose.
McKenzie wrote a standard text on the structure of political parties.