Jodie Katz has never volunteered for any political campaign. This time around, though, she feels she has no choice. On a cold windy morning in early April, she devoted hours to dropping off lawn signs for her Toronto riding's Conservative candidate, Karen Stintz. "I am a put-your-money-where-your-mouth is kind of gal," said Katz. "The Liberals cannot win this riding, the Liberals cannot win the election." Katz, originally from Ottawa, has never voted Conservative before. She says she has mostly voted for the NDP, with some Liberal votes as well. But this election she says she is supporting the Conservatives based...