What happens now that Biden dropped out? The chaotic 1968 Democratic convention could be a clue.
Briefly

Biden's exit could result in a contested Democratic National Convention in August, allowing previously bound delegates to choose the nominee, a situation not seen since 1968.
Biden faced mounting criticism over his age and cognitive abilities, amplified by reports on mishandling classified documents and a poorly received debate with Trump, sparking debates within the Democratic party.
In the 1968 elections, President Lyndon B. Johnson's withdrawal led to a contested convention where his VP, Hubert Humphrey, ultimately emerged as the nominee through strategic delegate accumulation tactics.
Read at Business Insider
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