For Garth, it's always about Garth Lorne Gunter, National Post Published: Wednesday, February 07, 2007 There's no mystery about why Garth Turner, the ousted Tory MP, has joined the Liberals. He wants to remain an MP after the next election, pure and simple. And the Liberals offer him his best chance--his only chance--of being re-elected. Mr. Turner will no doubt explain away his decision to join Stephane Dion's caucus as a tough choice, made after the most profound consideration of all the options, and only after wide consultation with his constituents. But that's because Mr. Turner -- a shameless...