That's what Conor proposes:
Folks on the right think leftists don’t confront the indefensible speech uttered by their side. And vice-versa. So why don’t the folks at The Corner enter into a bargain with a prominent blogger on the left?
What do you say, Matt Yglesias or Kevin Drum or Jonathan Chait? Here’s how it would work. Every day for a week, Monday through Friday, The Corner’s designated blogger could draft one post for publication on the left-leaning blog. The catch? They’d be limited to offering five direct quotations per day of lefties engaged in indefensible rhetoric, however they define it (in context, of course).
In return, the liberal interlocutor could publish the equivalent post at The Corner. And every day for a week, the participants would have to read one another’s five examples for that day, and decide whether to acknowledge that they’re indefensible and assert that the source should apologize if he or she hasn’t done so… or else defend the remark(s).
Maybe I’m wrong. But I suspect that Yglesias, Drum, and Chait would all be game for this sort of exchange. And that it wouldn’t be approved at The Corner in a million years.