I don't believe that this is accurate. According to the Watergate hearings and a history of the IRS that I read some time ago, Nixon planned on using the IRS against war protestors and political opponents, but never did. In fact, I believe that one of the charges against Nixon during Watergate is that he conspired to use the IRS in this fashion, but he was never actually charged with carrying out the plan. Could be wrong about this, but I don't think I am.
On the other hand, it has been documented that John Kennedy did use the IRS against his political opponents, as did Clinton. Which makes me wonder why this guy decided to bring up Nixon...
You forgot the </sarcasm> tag.