I present a search for the associated production of the
supersymmetric particles, the chargino and the neutralino carried out
with 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, 11 supersymmetric events are
expected, but the observation of 7 events is consistent with the
standard model expectation of 6.4 events. The mSUGRA model of
supersymmetry is constrained and charginos with masses up to 145
GeV/c2 are ruled out. I also discuss a method to apply the
observations to generic susy models with a similar signature.
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