Well, sure, I think they would let you go. However, don't you think it would be rather disingenuous of you to do so? Obama's campaign is using their resources and people to train their activists who probably expect to be amongst like-minded friends. I don't think it would be a very nice thing to do.
Yeah I would totally agree with you on that it wouldn't be a nice thing and disingenuous to do under the context of acting like an Obama supporter.
However I have to admit I still think it would be an interesting learning opportunity to go.