They are giving him the “Trump Treatment”.
They target one guy and go after him repeatedly until stupid people start up with their whine about "no smoke with out fire" and "Not ALL democrat investigations are witch hunts". Actually the really stupid ones start with that out the gate.
Eventually the guy gets tired of it and goes off and the democrats cheer and mark another one off their list knowing that now they have made good people even more reluctant to seek office which leaves their field wide open.
This has been going on since Nixon.
They did the same thing to Reagan.