Manchin can't force the DNC to hold a contested convention. He doesn't lead it, Biden does.
Doubtful there will be a contested convention because most of the people floated to be competitors for the nomination have already endorsed Harris as the Democratic candidate for POTUS.
Manchin's FoS.
SMH A contested Democratic convention DOES NOT guarantee a victory for the Republicans --or in this case, the Fascist Trump/Vance ticket.
Stop posting RW libertarian fan fiction.