Presidential primaries

National binding primary era (1972–present)

The impetus for national adoption of the binding primary election was the chaotic 1968 Democratic National Convention. Vice President Hubert Humphrey secured the presidential nomination despite not winning a single primary under his own name. After this, a Democratic National Committee-commissioned panel led by Senator George McGovern – the McGovern–Fraser Commission – recommended that states adopt new rules to assure wider participation. A large number of states, faced with the need to conform to more detailed rules for the selection of national delegates, chose a presidential primary as an easier way to come into compliance with the new national Democratic Party rules. The result was that many more future delegates would be selected by a state presidential primary. The Republicans also adopted many more state presidential primaries. By 1992, Democrats had primaries in 40 states and Republicans in 39.