Editor’s Note: Each week we cross-post an excerpt from Katrina vanden Heuvel’s column at the WashingtonPost.com. Read the full text of Katrina’s column here.

In the early third century BC, after King Pyrrhus of Epirus again took brutal casualties in defeating the Romans, he told one person who offered congratulations, “If we are victorious in one more battle with the Romans, we shall be utterly ruined.” In his more sober moments, Mitch McConnell (R-KY), about to achieve his lifelong ambition of becoming Senate majority leader, may wonder whether he, too, has achieved a pyrrhic victory.

Republicans are still crowing about the sweeping victories in 2014 that give them control of both houses of Congress. They will set the agenda, deciding what gets considered, investigated and voted on. Their ideas will drive the debate.

But Republicans have no mandate because they offered no agenda. Republicans reaped the rewards of McConnell’s scorched-earth strategy, obstructing President Obama relentlessly, helping to create the failure that voters would pin on the party in power. But the collateral damage is that the “party of ‘no’ ” has no agreement on what is yes. Instead of using the years in the wilderness to develop new ideas and a clear vision, Republicans have used them only to sharpen their tongues, grow their claws and practice their backhands.

Read the full text of Katrina’s column here.