Michael McGinn (born December 17, 1959) is an American lawyer and politician. He served as mayor of the city of Seattle, Washington and is a neighborhood activist and a former State Chair of the Sierra Club.In what was characterized as a "sea change in the power structure of Seattle," McGinn differentiated his campaign by his opposition to the proposed tunnel replacement to the Alaskan Way Viaduct. He won election in November 2009 with the support of groups considered to be "political outsiders" such as environmentalists, biking advocates, musicians, advocates for the poor, nightclub owners, and younger voters.