  The (001) surface of La_{1-x}Ca_xMnO_3 system in various magnetic orderings
is studied by first principle calculations. A general occurrence is that z^2
dangling bond charge -- which is ``invisible'' in the formal valence picture --
is promoted to the bulk gap/Fermi level region. This drives a
double-exchange-like process that serves to align the surface Mn spin with its
subsurface neighbor, regardless of the bulk magnetic order. For heavy doping,
the locally ``ferromagnetic'' coupling is very strong and the moment enhanced
by as much as 30% over the bulk value.
