  We propose a class of wave functions that provide a unified description of
antiferromagnetism and d-wave superconductivity in (doped) Mott insulators. The
wave function has a Jastrow form and prohibits double occupancies. In the
absence of holes, the wave function describes antiferromagnetism accurately.
Off diagonal long range order develops at finite doping and the superconducting
order parameter has d-wave symmetry. We also show how nodal quasiparticles and
neutral spin excitations can be constructed from this wave function.
