  An operatorial theoretical model based on raising and lowering fermionic
operators for the description of the dynamics of a political system consisting
of macro--groups affected by turncoat--like behaviors is presented. The
analysis of the party system dynamics is carried on by combining the action of
a suitable quadratic Hamiltonian operator with specific rules (depending on the
variations of the mean values of the observables) able to adjust periodically
the conservative model to the political environment.
