Perhaps it's a statement about the cultural phenomenon of fanfiction. Obama, as a well - read and intellectual person, might be interested in seeing how modern writers and fans are using Lincoln as a muse for their fictional works. It could also be a way to bridge the gap between history and modern creativity. Fanfiction allows for a more personal and sometimes radical re - interpretation of historical figures, and Obama reading Lincoln fanfiction could be a sign of his openness to new ways of looking at historical icons.
Well, it could be just a strange or humorous idea. Maybe it shows Obama's interest in Lincoln and he's exploring fictional interpretations of Lincoln's life in a sort of modern, fan - created way. It might also be a satirical statement about how people today can engage with historical figures in unexpected fictional scenarios.