Paul Wells mentioned how the Liberals are welcoming this, feeling that it will energize the base and scare Dippers back to the fold. To a certain extent, that's probably true. But this is all based on demonizing Harper and I think we can all agree that Stephen Harper doesn't look nearly as scary as he did 18 months ago.
There's also the fact that the Tories are now in the 32-36 range for poll numbers, up from their earlier 27-30 range. Since the Tories can form government with 1 or 2 percent of the popular vote less than the Liberals, if they can get 34% on voting day, it really doesn't matter how many NDP voters get scared to the Liberals since, so long as Jack keeps his base, the Tories still form government.