42. Andrew Johnson (1865-1869)
Historians gave Johnson meager ratings for butting heads with Congress. When Lincoln was assassinated, Johnson, who became president, refused to compromise with radical Republicans bent on combating the old Confederacy. He often tried to side-step them and was even faced with impeachment, but one vote acquitted him.
41. Franklin Pierce (1853-1857)
When it came to pursuing equal justice for all Americans, Pierce received low ratings. He signed the Kansas-Nebraska Act into law, allowing residents of new territories to decide for themselves on the legality of slavery.