Lieutenant Governor Pierre Menard stays active in Illinois politics after 1822, instead of retiring from public life. https://en.wikipedia.org/wiki/Pierre_Menard Maybe he becomes Governor or Senator. (POTUS is apparently out; though he had come to the Illinois country as a youth and been active in civic and political affairs for three decades, he was not formally naturalized a US citizen until 1816. https://books.google.com/books?id=xFwz8SAOxMAC&pg=PA7)
Alternatively, maybe he writes Don Quixote
http://www.coldbacon.com/writing/borges-quixote.html
Alternatively, maybe he writes Don Quixote