We prove the existence of at least two doubly periodic vortex solutions for a self-dual CP (1) Maxwell-Chern-Simons model. To this end we analyze a system of two elliptic equations with exponential nonlinearities. Such a system is shown to be equivalent to a fourth-order elliptic equation admitting a variational structure.2000 Mathematics Subject Classification: 35J60. The vortex solutions for the self-dual CP (1) Maxwell-Chern-Simons model introduced in [14] (see also the monographs [9, 12, 22]) are described by a system of two elliptic equations with exponential nonlinearities defined on a two-dimensional Riemannian manifold. Such a system (henceforth, the "CP (1) system") was considered in [7], where among other results the authors prove the existence of one doubly periodic solution by super/sub methods. On the other hand, formal arguments from physics as well as certain analogies with the U (1) Maxwell-ChernSimons model [5,19] and with the CP (1) "pure" Chern-Simons model [6,13]