IN USA TODAY, TAXPROF PAUL CARON ON THE ONE YEAR ANNIVERSARY OF THE IRS SCANDAL: The media ignore IRS scandal: We need to get to the bottom of it by giving Lois Lerner full immunity in exchange for her testimony.

Related: The IRS scandal for dummies.

Now with the warrant of Caron’s column I add my usual reminder. Nixon’s efforts to misuse the IRS were futile. They went nowhere. Nixon and his henchmen desired the IRS to “screw” their political opponents, but their efforts were a pathetic failure.

Nixon henchman Jack Caulfield astutely complained that the IRS was a “monstrous bureaucracy…dominated and controlled by Democrats.” As we have come to see, Caulfield was on to something. By contrast with Nixon’s failures to misuse the IRS, the IRS have very effectively “screwed” Obama’s political opponents, and we have yet to learn what the president knew and when he knew it.

Indeed. Though it’s possible that the IRS is so politicized that its employees needed no explicit instructions to go after Obama’s enemies. Arguing against that, however, is the White House’s stonewalling.