  The relation between the pion's quark distribution function, $q(x)$, its
light-front wave function, and the elastic charge form factor, $F(\Delta^2)$ is
explored. The square of the leading-twist pion wave function at a special probe
scale, $\zeta_H$, is determined using models and Poincare covariance from
realistic results for $q(x)$. This wave function is then used to compute form
factors with the result that the Drell-Yan-West and quark counting
relationships are not satisfied. A new relationship between $q(x)$ and
$F(\Delta^2)$ is proposed.
