  The critical behavior of the Ginzburg-Landau model is described in a
manifestly gauge-invariant manner. The gauge-invariant correlation-function
exponent is computed to first order in the $4-d$ and $1/n$-expansion, and found
to agree with the ordinary exponent obtained in the covariant gauge, with the
parameter $\alpha=1-d$ in the gauge-fixing term $(\partial_\mu A_\mu)^2 /2
\alpha$.
