"Why do you think that [Stephane Dion and Bob Rae] can beat Stephen Harper's Tory government, who for the most part have very few weaknesses?"
Instead of bothering to answer a loaded question, I'll ask one in return:
"Why do you think that Michael Ignatieff's policies won't drive every left-leaning Canadian either away from the polls or into the arms of the NDP?"
His supporters may apologize over and over again, but the fact remains: Ignatieff has irrevocably associated himself with Bush's disastrous war in Iraq, Israel's disastrous war in Lebanon, and the disastrous idea that torture is effective. (Ignatieff's professed distaste notwithstanding.)
Any Canadian that looks beyond the borders of Canada and sees something more than bad guys to be clubbed into submission is going to be very, very leery of the man.
(Yes, I'm aware of the North Korean situation. I'll get to that in a bit. First thing's first though: yes, Virginia, there is such a thing as international law, and it does serve a role. If it didn't, there wouldn't be an international economy.)