Lynn Parramore, "An Inconvenient Truth About Lincoln (That You Won’t Hear from Hollywood)," Naked Capitalism, 22 November 2012.
See some of the comments following the article too.
The "inconvenient truth" is that Loncoln was a lawyer for the railroads, the mega-corporations of his day. I think only people ignorant of history, or of the realities of U.S. politics then and now, would find this unexpected. I have to wonder what kind of myths and illusions the new film is promoting.
For Abraham Lincoln and Karl Marx, not an actual series of correspondence, see:
An Unfinished Revolution: Karl Marx and Abraham Lincoln. Robin Blackburn, editor. London: Verso, 2011.
[Publisher; Google Books; Amazon.com.]