That sounds unrealistic. How do you make corruption illegal when the people who benefit from corruption are the ones who have the power to make it legal? At the very least, they get to decide which cases to pursue.

The only non-violent way the Constitution affords us. Article V Convention of States. For congress to overturn an amendment requires a 2/3 majority in both houses. That doesn't mean it can't happen. Just much more difficult than passing a bill.