https://www.youtube.com/watch?v=mbGthanjU6M
The_Tall_Target was released in 1951, about a dozen years before the Lincoln-Kennedy_coincidences started to become noticed.
"New York Police Sergeant John Kennedy once guarded Abraham Lincoln for 48 hours while he was campaigning for President of the United States, and came away deeply impressed by the man. Kennedy has infiltrated a cabal and discovered that an assassination attempt will be made as the president-elect makes his way by train via Baltimore to Washington, DC." https://en.wikipedia.org/wiki/The_Tall_Target#Plot
https://en.wikipedia.org/wiki/Baltimore_Plot#In_popular_culture
https://www.thehenryford.org/collections-and-research/digital-resources/popular-topics/kennedy-limo
https://en.wikipedia.org/wiki/Lincoln_Motor_Company#1961_Lincoln_Continental_SS-100-X
https://www.jfklibrary.org/asset-viewer/archives/JFKWHP/1961/Month%2011/Day%2014/JFKWHP-1961-11-14-E
https://en.wikipedia.org/wiki/Lincoln-Kennedy_coincidences_urban_legend#Accuracy
