Twice now the public sector unions and their allies have tried to change the balance of power in Wisconsin. Twice they have failed.The battle isn’t over; an attempt to recall Governor Scott Walker appears inevitable next year. And fans of the blue social model can draw some hope; both the judicial and recall elections in Wisconsin saw Democrats make gains even as they fell short.The tide is running hard against the public sector unions. Wisconsin has been a big, Battle of Gettysburg style defeat, but the unions are suffering almost as much at the hands of their “friends” — Democratic politicians in blue states — as from open enemies like the Wisconsin GOP. In New York, in Chicago, even in California, Democratic politicians are playing hardball. They can’t help it. There isn’t any money.The public sector unions aren’t fighting a party; they are fighting arithmetic. Sooner or later, numbers win.