FILE - In this Jan. 3, 2017 file photo, U.S. Rep. Tim Walz, D-Minn., waves during his mock swearing-in ceremony on Capitol Hill in Washington. Walz said Monday, March 27, 2017, that he is running for governor of his home state of Minnesota in 2018 rather than trying to keep his seat in Congress. He joins a field of several Democrats seeing to replace fellow Democrat Gov. Mark Dayton, who's retiring. (AP Photo/Zach Gibson, File)