This photo provided by Papers of Abraham Lincoln project shows a note written by Abraham Lincoln. Historians believe they’ve unraveled the mystery of a cryptic note Lincoln penned that doesn’t identify the recipient by name and has a section clipped out. Researchers at the Papers of Abraham Lincoln project concluded Lincoln was writing to an ally to ask him to maintain a secret relationship with a political insider during the 1860 election campaign. Lincoln asked his cohort to "keep up a correspondence" with the person. The use of that phrase gave researchers their best clue. They ran it through a searchable database they are compiling of Lincoln’s papers and found several matches. (AP Photo/Papers of Abraham Lincoln project)
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