If the president and his allies operate on the principle that failure to raise the debt ceiling is an unthinkable outcome, to be avoided at all cost, then they have ceded all power to those willing to bring that outcome about. In effect, they will have ripped up the Constitution and given control over America’s government to a party that only controls one house of Congress, but claims to be willing to bring down the economy unless it gets what it wants.

Now, there are good reasons to believe that the G.O.P. isn’t nearly as willing to burn the house down as it claims. Business interests have made it clear that they’re horrified at the prospect of hitting the debt ceiling. Even the virulently anti-Obama U.S. Chamber of Commerce has urged Congress to raise the ceiling “as expeditiously as possible.” And a confrontation over spending would only highlight the fact that Republicans won big last year largely by promising to protect Medicare, then promptly voted to dismantle the program.

But the president can’t call the extortionists’ bluff unless he’s willing to confront them, and accept the associated risks.