I'd hazard a guess that this wouldn't work because the occupy movement is made up of many different groups with many different agendas that happen to share on a few vague common points like not liking wealth disparity, not liking the state of the economy and liking occupying places. Trying to pull together a political party out of that would be very hard, how on Earth could they create a workable manifesto under the guise of a few shared ideals? How will they decide energy, foreign, science etc policy? How would they even decide what social and economic steps would lead to achieving their goals? Some might just advocate tougher regulation of private enterprise with more taxes (e.g. social responsibility audits and financial transaction taxes) but others would argue for a full confiscating of private property and the installation of a near communist state. Others would argue for no state and how you build a viable political party out of anarchists I have no idea.