Until 1968, presidential candidates were picked by party conventions – a process revived by Biden’s withdrawal from race The ConversationWhen is the DNC? Here’s what to know about 2024 convention after Biden drops out of race USA TODAYWhat Happens Next Now That Biden Has Dropped Out? The Wall Street JournalTruman and Johnson Also Stepped Aside, but ‘the Circumstances Are Quite Different’ The New York Times