Billionaire campaign donor David Koch, heir to a fortune and a political legacy created by one of the driving forces behind the John Birch Society, makes no secret of his enthusiasm for Wisconsin Gov. Scott Walker.

“What Scott Walker is doing with the public unions in Wisconsin is critically important. He’s an impressive guy and he’s very courageous,” Koch explained in a recent conversation reported by the Palm Beach Post. “If the unions win the recall, there will be no stopping union power.”

That’s no surprise. What is surprising is that Koch now appears to be bragging about how he and his brother Charles are using their vast fortune to fund an independent campaign aimed at “helping” Walker. Even in an era when billionaires such as the Kochs are emerging as key financiers of super PACs and other campaign vehicles, Koch’s admission will raise eyebrows — and questions about whether inappropriate coordination by a candidate, his campaign and a supposedly independent group might be the stuff of “scandal.”