In the months leading up to the 1972 Democratic National Convention, the Democratic Party, hoping to ensure greater minority representation, adopted new rules for how delegates to its convention would be chosen.
When its delegates met at the convention in Miami Beach, Florida, the party refused to seat the fifty-nine Chicago delegates elected in the Illinois Democratic Party primary. Daley had slated these delegates, and the party leadership claimed that the slating process had violated the new rules. Instead, the party seated an alternate slate of delegates.

Certification of Richard J. Daley as an elected delegate to the Democratic National Convention, 1972. RJD_02_02_0013_0003_006