A number of FReepers have convinced me that the Chicago mob had incriminating evidence on Arkancides and blackmailed the Clintons in the 2008 contest. The Clintons were unable to use their vaunted private detective operation to dig out all the background on Baraq. Mutually assured destruction.
BJ and Hillary are now taking advantage of Barag's disastrous 4 years in office and applying subtle jabs when they can.
I have read in various places that they threatened Chelsea. Don’t know the time frame of the threats.
I tend to go with the theory it was competing factions and the Chicago Mob is ruthless.