Another Democrat has filed paperwork in Frankfort to run for the office of Louisville mayor next year.Tyler Allen has submitted a letter of intent to the Kentucky Registry of Election Finance that allows him to begin raising and spending money for a mayoral bid.Allen is president of USA Image, a Louisville printing company, but may be better known by many as co-founder of the 86-64 campaign, which proposes an alternative to the Ohio River Bridges Project.Allen says he's not ready to comment publicly on his candidacy, but a formal announcement will be forthcoming.Three other Democrats have announced they'll seek the mayor's office: Metro Councilmen David Tandy and Jim King, businessman Greg Fischer and west Louisville resident Connie Marshall.Republican Chris Thieneman said this week he'll run for mayor.Louisville coffeee shop owner Nimbus Couzin is running as an independent.Current Mayor Jerry Abramson won't seek a final term in order to run for Lt. Governor in 2011.