if Occupy Wall Street had made repealing Citizens United as their main platform
It would have been ignored, just like all their other platforms.
OWS was a moment for progressive organizing and collective altruism. But the biggest benefits of the movement came from their Rolling Jubilee, their local collectivism leading to shutdowns throughout Manhattan and other big urban centers, and their educational initiatives to turn the tide on anti-socialist propaganda.
This was never a Congressional lobbying operation. It wasn't designed to be.