They've got muck; we've got rakes. TPM Muckraker

Ex-Walker Aide Returns To Work After Extended Leave, FBI Raid

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Newscom

The FBI's search of Archer's home is thought to be connected to an ongoing "John Doe" investigation -- a secret proceeding in which witnesses can be subpoenaed to testify under oath, but are forbidden from talking publicly about the case. The investigation originally stemmed from a Walker staffer resigning in 2010, when she was found using her county time to post reader comments on online newspaper article promoting Walker's gubernatorial candidacy and criticizing his opponents.

Late last month, Walker's spokesman Cullen Werwie was given immunity in the investigation.