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President Abraham Lincoln. (Photo by Matthew Brady/Buyenlarge/Getty Images)

President Abraham Lincoln. (Photo by Matthew Brady/Buyenlarge/Getty Images)

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Abraham Lincoln

Abraham Lincoln

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22nd September 1862: Abraham Lincoln (1809 - 1865), the 16th President of the United States of America (1861 - 1865), at the signing of the Emancipation Proclamation, which gave slaves their freedom. (Photo by Hulton Archive/Getty Images)

22nd September 1862:  Abraham Lincoln (1809 - 1865), the 16th President of the United States of America (1861 - 1865), at the signing of the Emancipation Proclamation, which gave slaves their freedom.  (Photo by Hulton Archive/Getty Images)

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377869 16: (FILE PHOTO) A photographic portrait is displayed showing Abraham Lincoln, the 16th president of the United States. Retired physician and medical historian, Norbert Hirschhorn wrote a study that suggests Lincoln''s use of a medication in the form of a blue pill for depression contained enough mercury to cause uncontrollable bouts of anger in the President and could have eventually killed him had he not stopped taking the pills. (Photo by Hulton/Archive/Getty Images)

377869 16: (FILE PHOTO) A photographic portrait is displayed showing Abraham Lincoln, the 16th president of the United States. Retired physician and medical historian, Norbert Hirschhorn wrote a study that suggests Lincoln''s use of a medication in the form of a blue pill for depression contained enough mercury to cause uncontrollable bouts of anger in the President and could have eventually killed him had he not stopped taking the pills. (Photo by Hulton/Archive/Getty Images)

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Abraham Lincoln, Portrait (B&W)

Abraham Lincoln, Portrait (B&W)