The McCutcheon effect
There is more than one way to demolish a wall, physical or legal. Go at it with a bulldozer, or weaken its foundations and await the collapse.
When it comes to undermining the structure of modern campaign finance law, Chief Justice John Roberts has done it both ways.
The 2010 ruling in Citizens United, which Roberts joined, was a judicial bulldozer, willy-nilly toppling precedents that had restricted corporate spending on elections.