How can we (peacefully) overthrow our corporate masters?

People always complain how our government is controlled by business interests but neither major American political party wants to challenge the corporate forces that have so much control over our government. However, if we can convince our representatives that they will not be reelected if they continue to support corporations over citizens, I don’t see why reform would be impossible. This question is, where do we start and what can we do on an individual level?