Answer:
The division in the Republican party
Step-by-step explanation:
The Factor that led to the loss of the Presidential Election by the republican party was due to the division in the party between Reagan and ford but Ford won the presidential ticket to contest the election using the platform of The republican party.
The republican party lost the presidential election in the congress because the congressmen/congresswomen who were republicans were divided between Ford and Reagan so this split in vote led to the lost of the republican party.