Supersymmetry is a robust theory for physics beyond the standard model. I will present a search for the associated production of the supersymmetric particles, the chargino and the neutralino. The search uses 2.0 inverse femtobarns of integrated luminosity collected by the CDF experiment at the Tevatron ppbar collider. The signature is the three lepton and missing energy "trilepton" signature. For a specific choice of parameters of the mSUGRA model of supersymmetry, 11 signal events are expected. However, the observation of 7 events is consistent with the standard model expectation of 6.4 events. I will present constraints on the mSUGRA model and discuss a method to apply the observations to generic supersymmetry models with a similar signature.