Tony Kushner wrote the screenplay for the film Lincoln, which focuses on the 16th president’s tumultuous final months in office. Kushner read more than 20 books before writing about Lincoln, a man who had "an enormous capacity for grief that didn’t deprive him of the ability to act."
http://www.npr.org/2012/11/15/165146361/kushners-lincoln-is-strange-but-also-savvy
