  A large forward-backward asymmetry is seen in both the top quark rapidity
distribution $A_{FB}^t$ and in the rapidity distribution of charged leptons
$A_{FB}^\ell$ from top quarks produced at the Tevatron. We study the kinematic
and dynamic aspects of the relationship of the two observables arising from the
spin correlation between the charged lepton and the top quark with different
polarization states. We emphasize the value of both measurements, and we
conclude that a new physics model which produces more right-handed than
left-handed top quarks is favored by the present data.
