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Crossing the Floor

The open, bilingual record of every floor crossing in Canadian parliamentary history — from Confederation to today.

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Pat O'Brien (2005) | Crossing the Floor

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Crossings
Pat O'Brien

Stood on Principlefederal- Ontario

PO

Pat O'Brien

2005Liberal→Independent

0/5 - Career destroyed

Why They Crossed

O'Brien left the Liberal caucus over the government's same-sex marriage legislation, sitting as an independent.

What Happened Next

O'Brien did not run in the 2006 election.

Related Crossings

Frank Branch

Liberal → Independent

Same party switch

David Kilgour (2nd crossing)

Liberal → Independent

Same party switch

Joe Comuzzi

Liberal → Conservative

Same party involved

Blair Lekstrom

BC Liberal → Independent

Same party involved

Bill Casey

Political Context

38th Parliament

Governing Party: Liberal
Government Type: minority
Total Seats: 308

Cite This Crossing

Crossing the Floor. (2005). Pat O'Brien: Liberal to Independent (2005). Retrieved 2026-06-07, from https://crossingthefloor.ca/crossings/pat-obrien-2005

Conservative → Independent

Same party involved