During the time when he was expected to play the title role, Liam Neeson did an extensive and timely amount of research on Abraham Lincoln. He read over 20 books and visited with the then-existing Lincoln Bicentennial Committee in Washington, D.C. The committee granted Neeson access to Lincoln's history such as personal letters. Neeson also visited Ford's Theater and viewed personal items such as Lincoln's wallet and the Bible used for his inauguration.

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