Abstract: Papers, mainly 1967-1972, of Donald O. Peterson, a liberal leader of the Wisconsin Democratic Party. The papers document Peterson's work in state and national Democratic party politics and reform initiatives. Major subjects include Peterson's leadership of Eugene McCarthy's 1968 presidential campaign in Wisconsin (available only on microfilm); his participation in the New Democratic Coalition (1968-1973), the Commission on Rules of the Democratic National Committee (1969-1972), and the Democratic Charter Commission (1973-1974); and his unsuccessful gubernatorial campaign in 1970. Also of interest is material on Peterson's involvement with George McGovern's 1962 senatorial campaign and Edmund Muskie's 1972 presidential campaign.