After leaving the military and returning to Minnesota, Koch became active in local
Republican politics. In addition to serving on her local party unit board, Koch actively volunteered for former Congressman
Mark Kennedy and former
Secretary of State Mary Kiffmeyer. Koch was first elected to the
Minnesota Senate in a 2005 special election, replacing
Mark Ourada, who resigned months earlier. She was re-elected in 2006 and 2010. Koch, a former assistant minority leader, was the first woman to serve as
majority leader of the Minnesota Senate, and the first Republican to do so since party affiliation.
Relationship with staffer On December 15, 2011, in a surprise announcement, Koch said she would resign from her post as majority leader of the
Minnesota Senate. Republican state senators indicated Koch had an "inappropriate" relationship with a staffer, whose identity would later be confirmed as former state Senate aide
Michael Brodkorb. Koch later apologized and did not seek re-election to another term in the Minnesota Senate. ==References==