With McCutcheon v. Federal Election Commission, Supreme Court rules aggregate limits on federal campaign contributions are unconstitutional.
"The Supreme Court on Wednesday issued a major campaign finance decision, striking down limits on federal campaign contributions for the first time. The ruling, issued near the start of a campaign season, will change and most likely increase the role money plays in American politics. The decision, by a 5-to-4 vote along ideological lines, was a sequel of sorts to Citizens United, the 2010 decision that struck down limits on independent campaign spending by corporations and unions. But that ruling did nothing to affect the other main form of campaign finance regulation: caps on direct contributions to candidates and political parties." -- Adam Liptak, the New York Times