In the Supreme Court this week, Elena Kagan, the new solicitor general, eloquently defended the longstanding ban on corporate spending in political campaigns. But the conservative justices who spoke showed a disdain for both Congress’s laws and for the court’s own prior rulings. If the ban is struck down, as we fear, elections could be swamped by special-interest money.

Conservative jurists talk about judicial modesty and deferring to the elected branches. But in the questioning, Justice Antonin Scalia made clear that he considers Congress to be a self-interested actor when it writes campaign finance laws. Chief Justice John Roberts and Justice Samuel Alito seemed to put little weight on the fact that the court has repeatedly upheld a ban on corporate campaign expenditures.

What the conservatives seemed most concerned about was protecting the interests of corporations. The chief justice and Justice Scalia seemed especially perturbed that what they see as the inviolable right of these legal constructs to speak might be infringed upon.

The conservatives also seemed incredulous that vast amounts of corporate money flooding into campaigns could be seen as corrupting the system. We agree with Senator John McCain, who told reporters after the argument that he was troubled by the “extreme naïveté” some of the justices showed about the role of special-interest money in Congressional lawmaking.