The five conservative justices on the Roberts Court have never met a campaign finance law—except for a disclosure requirement—that they see as constitutional, and the most important lesson of McCutcheon v. Federal Election Commission is the vulnerability of laws of all types regulating election spending.

In McCutcheon, the U.S. Supreme Court, in a 5-4 decision, declared unconstitutional a provision of the Bipartisan Campaign Finance Act that imposed aggregate limits on campaign contributions.