  We discuss combining gravitational lensing of galaxies and the cosmic
microwave background (CMB) by clusters to measure cosmographic distance ratios,
and hence dark energy parameters. Advantages to using the CMB as the second
source plane, instead of galaxies, include: a well-determined source distance,
a longer lever arm for distance ratios, typically up to an order of magnitude
higher sensitivity to dark energy parameters, and a decreased sensitivity to
photometric redshift accuracy of the lens and galaxy sources. Disadvantages
include: higher statistical errors, potential systematic errors, and the need
for disparate surveys that overlap on the sky. Ongoing and planned surveys,
such as the South Pol Telescope in conjunction with the Dark Energy Survey, can
potentially reach the statistical sensitivity to make interesting consistency
tests of the standard cosmological constant model. Future measurements that
reach 1% or better precision in the convergences can provide sharp tests for
future supernovae distance measurements.
