  We cross correlate the gravitational lensing map extracted from cosmic
microwave background measurements by the Wilkinson Microwave Anisotropy Probe
(WMAP) with the radio galaxy distribution from the NRAO VLA Sky Survey (NVSS)
by using a quadratic estimator technique. We use the full covariance matrix to
filter the data, and calculate the cross-power spectra for the lensing-galaxy
correlation. We explore the impact of changing the values of cosmological
parameters on the lensing reconstruction, and obtain statistical detection
significances at $>3\sigma$. The results of all cross correlations pass the
curl null test as well as a complementary diagnostic test using the NVSS data
in equatorial coordinates. We forecast the potential for Planck and NVSS to
constrain the lensing-galaxy cross correlation as well as the galaxy bias. The
lensing-galaxy cross-power spectra are found to be Gaussian distributed.
