He had no comment as he rushed from the federal building after a court appearance Saturday.
Prosecutors say a campaign worker recorded Smith taking a bribe to help a daycare center.
According to the criminal complaint, Smith used state stationary to request a $50,000 state grant for the center and he accepted $7,000 in exchange.
Smith's primary opponent, Tom Swiss, has called on Democratic party leaders to reject Smith.
A group of West Side politicians held a rally Sunday in support of his re-election.
Some said they're worried that a man who's really a republican could win in the overwhelmingly Democratic district.
"Should he be elected, then this whole community of Democrats then could not expect to be represented by their member of the state legislature," said