The ascendance of the Ignatieff Liberals to the "top" isn't really happening, despite a few recent polls claiming they were on top (hell, the NDP was on top in some polls in 1988, I recall, and we know how long that lasted, and that it never happened again).
Polls are, after all, weird things.
Iggy and the Libbies have stalled, run out of breath.
And the Conservatives of Harper are once again in the lead.
Who's got the endurance?
Who's got what it takes to win (without cheating and lying, that is)?