The Supreme Court just made it much easier to bribe a member of Congress

The Supreme Court’s conservative majority has been at war with campaign finance laws for more than a dozen years, stretching at least as far back as its decision in Citizens United v. FEC (2010). On Monday, the Court’s six Republican appointees escalated this war.

The Court’s decision in FEC v. Ted Cruz for Senate is a boon to wealthy candidates. It strikes down an anti-bribery law that limited the amount of money candidates could raise after an election in order to repay loans they made to their own campaign.

Federal law permits candidates to...