It's really interesting how opinions change on an event or a person with the passage of time. Here, Dr Mudd is on the 'death' list and from what I gather, was saved by one vote from the gallows. He went to Ft Jefferson and while there ended up a hero of sorts. Andrew Johnson pardoned him in 1869 and he was allowed to come back to Maryland. There's a school named after him. Google is loaded with sites that have info on him. Yet Mary Surratt was not proven to be a part of any conspiracy but because of her 'relationship' to some involved, she was allowed to 'fall'. It must have driven the prosecution crazy because they couldn't tie in Davis or some of the others they would have loved to hang.
I do wonder, even though he may have been a model prisoner, and did become the prison doctor, why did Johnson pardon Mudd just four years later? Could Johnson 'know' for sure that Mudd was just acting in his medical capacity when Booth came for help? If he didn't know this for sure, why would he pardon anyone who was convicted of anything having to do with the assisanation of the President?