"If prosecuting politically unpopular speech becomes the 'new normal,' you can bet this tactic will be embraced by both parties."

"Left-wing individuals and groups are at least as guilty of coordinating their expenditures and efforts with Democrats as conservatives are with Republicans," writes Larry Kaufmann at Isthmus.

If the Supreme Court does not unambiguously repudiate the basis for the current John Doe probe, the GOP is empowered to launch similar investigations into left-leaning organizations in 2016 and beyond. The next group at the business end of a John Doe battering ram could be One Wisconsin Now rather than the Club for Growth.

You would think every commentary on John Doe would recognize this danger, but you would be wrong...