True victory over campaign spending requires amending the Constitution. This can be done as a Constitutional amendment or a Constitutional Convention.
Constitutional Amendment: Half (19) of the states necessary to amend the Constitution have called for an amendment that, generally, overturns Citizens United to allow the government to impose limits on political spending and opposes the idea that corporations are people. This idea has bipartisan support, with a September 2015 poll showing that over 80% of Democrats and Republicans supported overturning Citizens United. Passage of a constitutional amendment requires the support of Congress as well.
Constitutional Convention: Vermont led the way in this by calling for a constitutional convention to address campaign finance reform and several other states followed suit. However, around 28 states have called for a constitutional convention to implement a Balanced Budget Amendment. Depending on how you interpret the constitution, these movements may be combined to reach the needed 34 states to convene a convention, which would likely not be limited by subject matter and would branch into numerous other topics. This recently prompted the Vermont Senate to move to reverse its call for a convention.