Tom Wilkinson -- Reverdy Johnson, a Surratt sympathizer and mentor to Allen, who was the former attorney general and U.S. senator.
Evan Rachel Wood -- Anna Surratt, daughter of Mary. She later had to fight for her mother's remains.
Kevin Kline -- Edwin Stanton, Lincoln's War Secretary who took charge of the crime scene after the assassination. He was very involved in the entire proceeding, including concocting a rather unique and painful hood for the accomplices while on trial.
Alexis Bledel -- Sarah Weston, the young Aiken's wife.
Justin Long -- "a role" ... The trade outlined everyone's role but his. Will this be, I dare say, Lincoln? (hah.)
Frankly, Kline would be enough to sell me, but I'm impressed both by the fresh story picked (and all the aspects Redford has to choose from), and the heaps of talent laid on it -- a mixture of names we'd expect and some surprises as well. Could this be a big twist for Long, perchance?