  We analyze the Casimir interaction of doped graphene. To this end we derive a
simple expression for the finite temperature polarization tensor with a
chemical potential. It is found that doping leads to a strong enhancement of
the Casimir force reaching almost $60\%$ in quite realistic situations. This
result should be important for planning and interpreting the Casimir
measurements, especially taking into account that the Casimir interaction of
undoped graphene is rather weak.
