Updated at 6:55 p.m.
Federal authorities arrested an Illinois state representative from Chicago on one count federal bribery charge Tuesday. Democrat Derrick Smith represents the 10th House District, which includes sections of the city's West and North sides.
The U.S. Attorney's office said it has Smith on tape accepting a $7,000 cash bribe this past weekend. Prosecutors alleged Smith took the bribe in exchange for supporting a $50,000 state grant request from a daycare center.
According to the criminal complaint, it was all set up by a paid FBI informant who did campaign work for Smith. The informant's conversations with the representative were recorded, the complaint said.
A call and e-mail to Smith's office were not returned. He appeared in court Tuesday afternoon, but made no comment about the charges.
Smith has only been a member of the House since last spring, when, with the backing of Illinois Secretary of State Jesse White, he was appointed to fill a vacancy.
"I am very disappointed with the conduct alleged in the charges," White said in a statement. "I am confident this case will be handled fairly and justly by the judicial system."
Smith's arrest came a week before Democratic voters pick between him and challenger Tom Swiss. Swiss said he thinks the news could actually cause problems for his campaign, by awakening Democratic leaders backing Smith who may have been taking the race for granted.
"This is going to alert everybody to this race and there's still six days left," Swiss said. "There's a lot bigger people out there with deeper pockets and larger armies that can come in and really do an awful lot of work."
Swiss is a former local Republican official who Democrats claim has run a racially-insensitive campaign in this West and North Side district.
WBEZ's Michell Eloy contributed reporting.