  We compute the two-loop corrections to the thermodynamical pressure of an
SU(2) Yang-Mills theory being in its electric phase. Our results prove that the
one-loop evolution of the effective gauge coupling constant is reliable for any
practical purpose. We thus establish the validity of the picture of almost
noninteracting thermal quasiparticles in the electric phase. Implications of
our results for the explanation of the large-angle anomaly in the power
spectrum of temperature fluctuations in the cosmic microwave background are
discussed.
