After the 1968 Democratic National Convention , at which pro-Vietnam War liberal Hubert Humphrey was nominated for the presidency despite not running in a single primary election , the Democratic Party made changes in its delegate selection process to correct what was seen as " illusory " control of the nomination process by primary voters . A commission headed by South Dakota Senator George McGovern and Minnesota Representative Donald M. Fraser met in 1969 and 1970 to make the composition of the Democratic Party 's nominating convention less subject to control by party leaders and more responsive to the votes cast in primary elections
1968 Democratic National Convention
1968 Democratic National Convention
Superdelegate