Will Polish politics damage Treaty progress?

This interesting question arises from a Financial Times piece, which points out that EU governments want to put the finishing touches to the constitutional treaty in Lisbon on October 18-19. However -

Some of the EU’s 27 countries are nervous that the conservative Polish government, now campaigning for a general election on October 21, will be in no mood to cut a deal.

That's pretty certain, I'd say, especially as they're asking for changes.