I think all the debates comes down to is not really how Harper performs--he'll be his usual self. It comes down to Iggy and if undecideds get comfortable with him and trust him. Tough to do. Harper needs to be careful not to attack his personal history, but his numerous flip flops on policy.
- if we're going to have yet ANOTHER election, which Harper would win in a landslide because (see Dief in the 60's) as my bet is Canadians are sick of this
- if the coalition should govern instead, while legal, most Canadians don't want to accept Iggy as PM
- if he refuses the coalition and tells them to get along with Harper for a while then may accept another election.