This is an impeachable offense, pure and simple:

In the last two weeks, two sources, one of them inside of the Justice Department, have told me that a scheme was hatched in the upper echelons of the Bush Administration shortly after it took office in 2001 or early in 2002. The project identified John Edwards and Hillary Clinton as likely Democratic challengers to President Bush, and identified prominent trial lawyers around the United States as the likely financial vehicle for Edward’s rise. It directed that their campaign finance records be fly-specked, and that offenses not be treated as administrative matters but rather as serious criminal offenses.

…

The deliberate use of the state security apparatus to target opponents and their supporters is illegal, and was the sort of circumstance that was specifically envisioned by the founding fathers as a reason for impeachment now.