Wall Street Journal: What's the real reason for Evan Bayh's retirement? It's not partisanship. The Democrats have had several tries and they can't govern from the left.

Americans have already sent one rebuke to Democrats in the form of Scott Brown's victory in Massachusetts. Now Mr. Bayh, a senior Member of their own party, has sent another by skipping town and putting another Senate seat in play. Our guess is that it will take one more repudiation in November before Democrats relearn that you can't govern America successfully from the political left.