Gov. Butch Otter filed his candidacy papers this morning with the Idaho Secretary of State's office to run for a third term. Otter, who hasn't yet made a formal announcement, has been gearing up his re-election campaign nonetheless. So have his challengers, including GOP primary opponent Russ Fulcher, the Senate majority caucus chairman; and Democratic candidate A.J. Balukoff. "Well, you're official," Secretary of State Ben Ysursa told Otter today. Otter's campaign manager Jayson Ronk said Otter will formally announce his candidacy "soon."