  A simple model, suitable to describe the dynamics of a political system
consisting of three macro--groups affected by turncoat--like behaviors and the
influence of the opportunistic attitudes of politicians on voters' opinion, is
presented. The model is based on raising and lowering fermionic operators whose
dynamics is ruled by a suitable quadratic Hamiltonian operator with the
addition of specific rules (depending on the variations of the mean values of
the observables) able to adjust periodically the model to the political
environment, \emph{i.e.}, we move in the framework of the so called
$(H,\rho)$--induced dynamics approach.
