  With the first data sample collected by the CLEO-c detector at the psi(3770)
resonance we have studied four exclusive semileptonic decays of the D0 meson.
Our results include the first observation and absolute branching fraction
measurement for D0 --> rho- e+ nu_e and improved measurements of the absolute
branching fractions for D0 decays to K- e+ nu_e, pi- e+ nu_e, and K*- e+ nu_e.
