It will be some time before the full impact of this week’s sellout by seven so-called “moderate” Republicans in the U.S. Senate becomes completely apparent. The plan to break Democrat filibusters of judicial nominees was, in reality, no less than a Republican fight to restore the integrity of the Constitution. But in the face of the Republican defections, Democrats will now credibly claim to have protected it, and the nation as a whole, from the ravages of Republican “extremism.” Despite media spin, this arrangement was no agreement among “centrists” from both parties. The seven Democrats who participated in the deal...