Lincoln was pen pals with Marx. Scamazon link, but:

https://www.amazon.com/gp/product/B005QSBW8A/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B005QSBW8A&linkCode=as2&tag=criticatheory-20

Lincoln was pen pals with Marx. Shitty source, but:

http://www.critical-theory.com/karl-marx-and-abraham-lincoln-penpals/