  Recently a set of diffeomorphisms were found which act nontrivially on the
Kerr horizon and form a left-right pair of Virasoro algebras. Using the
boundary formula for the associated central charge and assuming applicability
of the Cardy formula to a putative dual CFT, the Bekenstein-Hawking entropy for
the Kerr black hole was reproduced. In this paper, the addition of charge to
the black hole is shown to require a minimal modification to this construction
which then reproduces the Bekenstein-Hawking entropy for the Kerr-Newman black
hole.
