Question: What former United States Senator appointed Sandy Rummel to the Metropolitan Council?

Context paragraphs:
David Karnes: David Kemp Karnes (born December 12, 1948) is a former United States Senator from Nebraska.  He is President and Chief Executive Officer of The Fairmont Group Incorporated, a merchant banking/consulting company with offices in Omaha and Washington.  Karnes also serves in an "of counsel" capacity to the national law firm of Kutak Rock and practices out of the firm's Omaha and Washington offices.  He joined the firm in 1989 following his tenure as a United States Senator.  He is currently involved in numerous civic, educational and charitable organizations in Nebraska and nationally.

Diane Neighbors: Diane Neighbors is the incumbent vice mayor of the United States Metropolitan Government of Nashville and Davidson County and the President of the Metropolitan Council of Davidson County.  She was elected on August 2, 2007, and on August 23, she was sworn into office as the seventh vice mayor in Metro history and the first woman to hold the post.

Ted Mondale: Theodore Adams "Ted" Mondale (born October 12, 1957) is a politician, entrepreneur, public administrator, and former Chief Executive Officer of the Minnesota Sports Facilities Authority, which oversaw Minnesota Vikings stadium from conception to operation.  He is the elder son of the former United States senator, United States ambassador and Vice President Walter Mondale and Joan Mondale.  He is a former Minnesota state senator, former Chairman of the Metropolitan Council, 1999-2003 , and former CEO of Nazca Solutions, Inc. - a technology fulfillment venture based in Minneapolis, Minnesota.

Paul Findley: Paul Findley (born June 23, 1921) is a former United States Representative from Illinois, who represented its 20th District.  A Republican, he was first elected in 1960.  Findley lost his seat in 1982 to current United States Senator Dick Durbin.  Findley attended Illinois College and is a member of Phi Alpha Literary Society.  He is a cofounder of the Council for the National Interest, a Washington, D.C. advocacy group.  He resides in Jacksonville, Illinois.

Mark Dayton: Mark Brandt Dayton (born January 26, 1947) is an American politician who is the 40th and current Governor of Minnesota, serving since 2011.  He was previously a United States Senator for Minnesota from 2001 to 2007, and the Minnesota State Auditor from 1991 to 1995.  He is a member of the Minnesota Democratic–Farmer–Labor Party (DFL), which affiliates with the national Democratic Party.

Montana gubernatorial election, 1920: The 1920 Montana gubernatorial election took place on November 2, 1920.  Incumbent Governor of Montana Sam V. Stewart, who was first elected Governor in 1912 and 1916, declined to run for re-election.  To replace him, former United States Senator Joseph M. Dixon won the Republican primary, which was closely contested.  In the general election, he faced Burton K. Wheeler, the former United States Attorney for the District of Montana and the Democratic nominee.  Ultimately, Dixon defeated Wheeler by a wide margin to win his first and only term as governor.

Joseph Begich: Joseph R. Begich (born January 17, 1930) is an American former politician in the state of Minnesota.  He was born in Eveleth, Minnesota.  He is an alumnus of the Northwest School of Agriculture, and is a grain and livestock farmer.  He served in the House of Representatives for District 6A from 1975 to 1982 and for District 6B from 1983 to 1992.  He is married to Carolyn and has one daughter.  He is the brother of former United States Congressman from Alaska, Nick Begich, and the uncle of former United States Senator from Alaska, Mark Begich.

Deb Fischer: Debra Strobel Fischer (born March 1, 1951) is the senior United States Senator from the state of Nebraska.  Previously, she was a two-term member of the Nebraska Legislature, representing the 43rd District.  She defeated former United States Senator Bob Kerrey in the election held on November 6, 2012, and assumed one of Nebraska's two Senate seats in January 2013.

Sandy Rummel: Sandy Rummel (born August 10, 1942) is a Minnesota politician and a former member of the Minnesota Senate who represented District 53, which includes portions of Anoka and Ramsey counties in the northeastern Twin Cities metropolitan area.  A Democrat, she was first elected to the Senate in 2006, but was unseated in the 2010 general election by Republican Roger Chamberlain.  She was subsequently appointed to the Metropolitan Council by Governor Mark Dayton on March 2, 2011.

Rónán Mullen: Rónán Thomas Mullen (born 13 October 1970) is an independent Irish Senator and former delegate to the Council of Europe.  He was elected by the National University of Ireland Seanad constituency in July 2007 and re-elected for a second term in 2011.  Mullen is a frequent media commentator on social and political topics.  The first National University of Ireland senator appointed to the Council of Europe, he received international coverage for his role in defeating the controversial "McCafferty Report" which sought to limit the right to conscientious objection for medical staff in the case of abortions.

Supporting paragraphs: Sandy Rummel Mark Dayton
Answer: Mark Dayton