So it looks like it's "go time"

-- OTTAWA -- Three federal by-elections in early September promise to stir up Canada's stagnant political waters, serving as a litmus test for a possible general election this autumn.

Prime Minister Stephen Harper is expected to call the by-elections this week in the Montreal-area ridings of Westmount-Ville Marie and St. Lambert and the southwestern Ontario riding of Guelph.

“They are all opposition-held ridings and anything less than two Liberal victories will be a huge defeat for Stéphane Dion's Liberals,” said Tory spokesman Ryan Sparrow.

Okay, Steffi... let's see what you've got.

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