  We report a measurement of the forward-backward charge asymmetry of electrons
from W boson decays in p anti-p collisions at s**(1/2) = 1.96 TeV using a data
sample of 170 pb-1 collected by the Collider Detector at Fermilab. The
asymmetry is measured as a function of electron rapidity and transverse energy
and provides new input on the momentum fraction dependence of the u and d quark
parton distribution within the proton.
