The effect shouldn't be exageratted, Labour's standing in the polls has merely been upgraded from "catestrophic" to "dire", but even so this crisis does appear to be helping the left, both here and abroad as Daniel Hannan notes:
No one said politics was fair. Strikes always hurt Labour, however much Labour condemns them. City bonuses always hurt the Tories, even when the Tories are in Opposition. In the current climate, what people see are fat-cat bankers being bailed out by hard-pressed taxpayers. And, instead of objecting to the bail-out, they object to the bankers and, by extension, to the free market culture they are thought to embody. The world over, Left-of-Centre parties are benefiting: Obama in the US, Brown here.
The paradox is that what Britain most needs at the moment is to cut spending and cut taxes. In retrospect, we can see that the massive extension of the federal government during the Great Depression served to prolong the slump. (Why the court-packing, four-term Roosevelt is so kindly treated by history remains a mystery to me.) Sadly, we seem about to repeat FDR's errors, engorging the state and mortgaging its citizens in order to socialise the financial system.
Similar effects are occuring in Canada and New Zealand, where right of centre parties that were heading for big wins now look like having to settle for just getting across the line in first place.