He made the announcement Thursday morning on the "Chaz & AJ in the Morning" radio show. He filed the required paperwork at City Hall later in the day.
Ganim was convicted on 16 corruption charges, including steering city contracts in exchange for hundreds of thousands of dollars worth of wine, custom clothes, cash and home improvements.
First elected in 1991, he was serving his fifth term when he was indicted in 2001.
Read the full story here at the NBC Connecticut website.
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