When the Wisconsin General Assembly voted to pass Gov. Scott Walker's budget repair bill, the Democratic legislators made themselves indistinguishable from the protesters surrounding the assembly floor. They wore the same pro-union orange T-shirts. They behaved in the same sophomoric way, breaking out in a noisy demonstration. They chanted the same ubiquitous word: "Shame!" They might as well have brought guitars onto the floor for a Woody Guthrie sing-along and touted "Walker = Hitler" signs. In Wisconsin, it's less that Democrats act to protect a special interest than that they belong to a special interest. A complete identification has long...