Even though this would probably be his political swan-song, because it is difficult (but not impossible) to see him winning in Halton as a Green Party Candidate. (Note that at the Halton Riding event held on Saturday, and reported here, Garth's going Green was tied for second place among his constituents as an option after "remaining independent").
And even though Green Party leader Elizabeth May would almost certainly come to view Garth as a pain in the ass. (I would love to see some of Garth's blog postings on the internal machinations of the Green Party:"They're raising money by having a salmon bake?".)
But Garth's defection would nevertheless constitute a historical moment in Canadian politics. Polling at about 10%, the Greens still do not have a seat in parliament and, given the de-centralized nature of their support, will be hard pressed to win one in the Federal election expected for next Spring, especially since Elizabeth May will likely not have a place on stage during the leadership debates. However, if Garth switches, his seat comes along with him, and when an election is called Elizabeth gets her crack at addressing a national audience with the other contenders.
If you doubt how much influence a single good debate performance can have, remember the B.C. Liberals of the early 1990s'. Gorden Wilson's performance in the 1991 CBC debate propelled the Libs from zero seats in the legislature to Official Opposition status. Elizabeth May has been quite impressive in her televised appearances, and giving a good account of herself in this forum could be the shot that realigns Canadian politics.
And realigns it in God knows what manner? Many Tories would apparently pick the Green Party as their second choice in an election. Surely the NDP could lose support to the Greens. And I would not be surprised if a good portion of Liberal supporters would be happy to embrace a Left-wing party not so enamored with the Working Class Hero bullshit of the New Democrats.
In short, Garth Turner has a chance to to something of historic significance. I hope he takes it.