Why did Darnays and dr manette's testimonies convince the jury to set Darnay free?

Darnay and Dr. Manette's testimonies were convincing because Dr. Manette's status as a respected figure vouched for Darnay's character, and Darnay's innocent explanation of the circumstances surrounding his trial was found to be credible by the jury. Additionally, the lack of concrete evidence linking Darnay to the crime further supported their decision to set him free.