This is a complex biopic, not easily accessible without your doing some homework. It helps if you've visited the Lincoln Museum in Springfield, Ill. It helps, too, if you've studied the democratic process and know the ambiance of the rough House of Representatives, say, over that of the sedate Senate. Also helpful is an understanding of the parallel lines of the 13th Amendment and the peace treaty that ended our Civil War. "Lincoln" covers these areas while concentrating on Abraham Lincoln, the man of wit and wisdom.