An expert says a letter written by Mary Todd Lincoln shows a rare side of the former first lady

A newly discovered letter written by former first lady Mary Todd Lincoln shows a side of her that is rarely seen, an author and historical document expert told FOX Business.

An 1864 letter from Mary Todd Lincoln, wife of Abraham Lincoln, is for sale for $15,000 by The Raab Collection in Philadelphia. It shows a rarely seen side of the first lady, said an expert.