The Liberals and Bloc are probably very concerned about the fact that they're poll numbers are dropping... just as any party would be. It's not really clear from your question what you're getting at.
With the NDP outpacing the Bloc in Quebec and pulling ahead of the Liberals nationally and running second to the Conservatives, I would think that would cause some panic in Bloc and Liberal ranks this late in the game.
This late in the election, what can they really do to reverse this development? My view is there's really not much they can do.