Maybe yes, maybe no. The Sun (care of the BBC) has them polling ahead of the other two parties following Nick Clegg's victory in the PM debate. People are tired of both Labour and the Tories, and are taking a fresh look at Clegg's crew. But Britain's first-past-the-post system means that it doesn't necessarily matter: the LibDems would have to crush the other parties to win a majority. They aren't crushing. Yet.
It's starting to feel like it might happen, though. The other parties are so tired, and the whole business is so tawdry, that a lot of Brits can be forgiven for wanting a change or three. Certainly a Labour/LibDem coalition is possible, and that could make a lot of big differences. But it's still early days, of course. Who knows what will happen next week.
(Makes one wonder about America, too. England has a third party, and they're doing pretty well. America's system isn't that much different...)