From Instapundit:

At any rate, members of Congress who are offended by an unannounced late-night raid on an office might profitably be asked what they think about late-night unannounced raids on private homes, which happen all the time as part of the Congressionally-mandated War on Drugs.

If anything, it ought to work the other way. I think if you searched 435 randomly selected American homes, and 435 Congressional offices, you just might find more evidence of crime in the latter. . . .

Exactly the point I made below.

UPDATE: And more sense making from streiff at Redstate:

If the search was truly a concern then that same concern should more rightfully have been raised when Jefferson’s home was raided. Clearly, a raid on your domicile is much more intimidating than a raid on your office.

The idea that somehow a legislative agenda was imperiled by the FBI raiding Jefferson’s office is laughable on its face. First and foremost, any legislation or correspondence a congressman is working on is not more important than a lot of other things in government and private life. Businesses who are raided are at risk of losing trade secrets and business models. The FBI has raided CIA offices and other federal offices containing really classified information and perhaps put it in danger of exposure. So while I could agree in principle that confidential information might be exposed, that is the price of breaking the law.

The detailed special instructions in the search warrant, beginning on page 78, show that uncommon deference was given to Jefferson and great deal of effort was devoted to searching the effects of William Jefferson, Democrat, Louisiana, the man, not William Jefferson, Democrat, Louisiana, the member of Congress.