That's exactly what we did with voteforchange in 08. Scott Thomas and Chris Hughes were the brilliant team behind that. Then they went back to a one page form, like the only thing good about voteforchange was that you could make it cutesy and brand it really easily for lots of different demographic groups and not the shit tons of UI research and optimization that went into creating the shortest possible path for the registrant, collecting partial data, saving application state, etc.