Not sure why his resignation is causing so much speculation and paranoia among the progressives and Liberals. He resigned from his 15 years of service as Sheriff, employment with the county, no the city or state. Clarke, a democrat, has been a colorful character who has the ability to get under the skin of his opponents.
He strikes me as the kind of guy who is not going to go to work in the oppressive environment of Washington DC politics. But, I suppose anything is possible. Maybe he will pursue a television career or maybe he will just go fishing.