For those of us living in the Garden State, the growing scandal over the firing of federal prosecutors immediately brought to mind the subpoenas that Chris Christie, the former Bush “Pioneer” who is now the U.S. attorney for New Jersey, issued two months before the 2006 election — and the way news of the subpoenas was quickly leaked to local news media.

The subpoenas were issued in connection with allegations of corruption on the part of Senator Bob Menendez, a Democrat who seemed to be facing a close race at the time. Those allegations appeared, on their face, to be convoluted and unconvincing, and Mr. Menendez claimed that both the investigation and the leaks were politically motivated.

Mr. Christie’s actions might have been all aboveboard. But given what we’ve learned about the pressure placed on federal prosecutors to pursue dubious investigations of Democrats, Mr. Menendez’s claims of persecution now seem quite plausible.

In fact, it’s becoming clear that the politicization of the Justice Department was a key component of the Bush administration’s attempt to create a permanent Republican lock on power. Bear in mind that if Mr. Menendez had lost, the G.O.P. would still control the Senate.

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The bigger scandal, however, almost surely involves prosecutors still in office. The Gonzales Eight were fired because they wouldn’t go along with the Bush administration’s politicization of justice. But statistical evidence suggests that many other prosecutors decided to protect their jobs or further their careers by doing what the administration wanted them to do: harass Democrats while turning a blind eye to Republican malfeasance.

Donald Shields and John Cragan, two professors of communication, have compiled a database of investigations and/or indictments of candidates and elected officials by U.S. attorneys since the Bush administration came to power. Of the 375 cases they identified, 10 involved independents, 67 involved Republicans, and 298 involved Democrats. The main source of this partisan tilt was a huge disparity in investigations of local politicians, in which Democrats were seven times as likely as Republicans to face Justice Department scrutiny.

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And let’s not forget that Karl Rove’s candidates have a history of benefiting from conveniently timed federal investigations. Last year Molly Ivins reminded her readers of a curious pattern during Mr. Rove’s time in Texas: “In election years, there always seemed to be an F.B.I. investigation of some sitting Democrat either announced or leaked to the press. After the election was over, the allegations often vanished.”