  We present a lattice QCD calculation with two dynamical flavors of the
isovector vector correlator in the high-temperature phase. We analyze the
correlator in terms of the associated spectral function, for which we review
the theoretical expectations. In our main analysis, we perform a fit for the
difference of the thermal and vacuum spectral functions, and we use an exact
sum rule that constrains this difference. We also perform a direct fit for the
thermal spectral function, and obtain good agreement between the two analyses
for frequencies below the two-pion threshold. Under the assumption that the
spectral function is smooth in that region, we give an estimate of the
electrical conductivity.
