I've claimed to support the Stormcloaks many times, citing that it is more about opposing the Empire than supporting Ulfric. While it is true that I think the Empire is a fractured shell that deserves to collapse, I actually think they are more deserving of winning the war. Part of the reason is selfish; all the Jarls I actually like are the ones Ulfric would have replaced. Another is because my character is Breton and wouldn't really fit with Ulfric's Nordic supremacist views. Lastly, I strongly believe that one should "never give power to angry people," and thus it feels really uncomfortable to throw my lot in with a violent revolution, especially one that made the first blow.