Minneapolis Mayor R.T. Rybak, D, who was just re-elected on Tuesday to a third term, already has his sights set on a higher office. Rybak filed the paperwork for a run for governor in 2010, jumping to the top of a long list of candidates in the Democratic field.

Rybak announced the move in an e-mail to supporters Thursday evening. “Filing these papers is the first step in the process of setting up the Rybak for Governor campaign,” he wrote. “In the weeks ahead, we will be building a grassroots campaign to take our message to every corner of the state.”

The popular mayor has not been shy about expressing his interest in the race, and has already participated in several gubernatorial candidate events, so the announcement comes as no surprise. Local observers expect him to be a formidable candidate, but not a shoo-in for the Democratic nomination.