Of course the gasoline can go stall in a car. It takes longer in a car than in a bike because a car has a vapor lock seal, whereas a bike does not. the gas fumes leak out through the seal. The fumes are important to the explosion within the engine. It is all about the physics. Drain it as Freakinout mentioned and also you may want to change the oil completely as it will settle and acidify too. To prevent this in the future: take the time to start and run your bike for several minutes at least once a week during the winter. Click the link below for more detailed info on how to winterize your bike.
http://www.cyberpoet.net/motorcycle/...c_storage.html