According to Deadline:
Now we can tell you the list of actors who'll be screentesting for the role of young Abe Lincoln this week and next: Benjamin Walker, James D'Arcy, Adrien Brody, Oliver Jackson-Cohen, and Josh Lucas. It's a very interesting mix of semi-knowns and unknowns, stage and screen vets.
If you were unaware, the story is basically a re-imagining of Lincoln's life where the president is an accomplished vampire killer - an obsession which he develops after the bloodsuckers murder his mother.
Abraham Lincoln: Vampire Hunter arrives in theaters June 22nd, 2012!