Memory Alpha is a wiki of the Star Trek universe. The site description reads, "Welcome to Memory Alpha, a collaborative project to create the most definitive, accurate, and accessible encyclopedia and reference for everything related to Star Trek." Interestingly, there are articles on 16 Presidents of the United States in Memory Alpha. Most give small pieces of trivia such as when a portrait of a president or a reference was made in the script to a president.
This is not the case with Abraham Lincoln. There is a substantial write up of this president. The reason? Abraham Lincoln (as played by Lee Bergere) actually appeared in an episode of the original Star Trek series titled the Savage Curtain.
The plot is summarized by Alpha Memory as, "Kirk and Spock are forced to fight alongside such historical figures as Abraham Lincoln of Earth and Surak of Vulcan by aliens who want to understand the concepts of good and evil." The Lincoln role is large and he eventually sacrifices himself to save the Vulcan Surak. Many modern day Confederate separatists may have strong feelings about Lincoln being portrayed as good but this episode of Star Trek portrays Lincoln as noble and righteous.
This episode of Star Trek also created a new made up Lincoln quote, "There is no honorable way to kill, no gentle way to destroy. There is nothing good in war except its ending."
I know have a strong urge to go and rent this episode. Of course, I will probably be disappointed. Those original series Star Trek episodes are never as good as how I remembered them to be.