 St. Paul Mayor Chris Coleman is running for governor in 2018. The Democratic mayor made it official with a Tuesday announcement. Coleman had long been considered as a possible gubernatorial candidate. Speculation increased earlier this month when Coleman said he wouldn't run for a fourth term as mayor. Coleman joins what's likely to be a crowded field to replace Governor Mark Dayton when his second term expires. State Representative Aaron Murphy has already launched a bid on the Democratic side. If you've enjoyed this segment of Lakeland News, please consider making a tax-deductible contribution to Lakeland Public Television.