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Crossing the Floor

The definitive bilingual database of political floor-crossing in Canadian history.

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Jack Horner (1977) | Crossing the Floor

Wanted Promotionfederal- Alberta

Jack Horner

1977Progressive Conservative→Liberal

4/5 - Major benefit - cabinet or SenateReceived Cabinet PostNotable Crossing

Why They Crossed

Horner was an Alberta Conservative who crossed to join Pierre Trudeau's Liberal cabinet. In Alberta, being a Liberal is almost unthinkable - this was a huge deal.

What Happened

He was given a cabinet post (Minister of Industry, Trade and Commerce) immediately. But Alberta voters were furious. He lost the next election badly. After politics, he was appointed to the Canadian Grain Commission - another government job.

What Happened Next

CCabinet Appointments

Minister without Portfolio

1977-04-20 - 1979-06-04 (under Pierre Trudeau)

Full biography of Jack Horner →

Historical Eras

Quiet Revolution & Quebec Sovereignty (1960-1980)Trudeau Era (1968-1984)

Related Crossings

2005

Belinda Stronach

Conservative → Liberal

Same party involved

1869

Richard John Cartwright

Liberal-Conservative → Liberal

Same party involved

2026

Matt Jeneroux

Conservative → Liberal

Same party involved

2024

Brendan Maguire

Liberal → Prog. Conservative

Same category

Political Context

The Crosser

Jack Horner

Jack Horner was a Canadian politician from Alberta. He served as a Progressive Conservative MP from 1958 to 1977 before crossing to the Liberals, receiving a cabinet post as Minister without Portfolio on the same day. He lost his seat in the 1979 election.

Wikipedia →

2006

David Emerson

Liberal → Conservative

Same category