Roger Brown has long been a Conservative Party member and donor, but not any more. Not after losing about $100,000 on his investments Wednesday because of Finance Minister Jim Flaherty's decision to tax income trusts.“It's the biggest loss I've ever experienced,” Mr. Brown said from his home in Nanaimo, B.C., as he watched 10 per cent of his life savings vanish. “The credibility in my mind of the Conservative Party has gone right down the toilet.”Mr. Brown, 51, ran a small business before selling it a few years ago. Now, because of the income trust situation, “I guess I might...