  We generalize the sum rule approach to investigate the nonperturbative
structure of QCD at high temperature. Salient features of the QCD phase above
$T_c$ are discussed, and included in the form of power corrections or
condensate insertions, in an operator product expansion of gauge invariant
correlators. It is shown that for a plausible choice of condensates, QCD at
high temperature exhibits color singlet excitations in the vector channels, as
opposed to merely screened quarks and gluons.
