Upon this man’s re-election, Karl Marx called him “the single-minded son of the working class.”

The Final Jeopardy clue on September 16, 2025, offered a historical and ideological twist that connected one of America’s most iconic presidents with one of the most influential political philosophers of the 19th century. The clue centered on a comment made by Karl Marx, the German philosopher and father of modern socialism, about an American president—specifically referring to him as a “single-minded son of the working class.”

Who is Abraham Lincoln?

This connection may surprise some, but it is historically grounded. Marx, writing in London during the American Civil War, admired Lincoln’s leadership and his efforts to preserve the Union and abolish slavery. When Lincoln was re-elected in 1864, Marx—then writing on behalf of the International Workingmen’s Association—penned a congratulatory letter. In that message, Marx praised Lincoln’s commitment to democratic ideals and social progress, aligning his presidency with the global struggle for worker rights and equality.

Lincoln’s Re-election and the Global Response

Abraham Lincoln’s re-election in 1864 came at a critical juncture in American history. The Civil War was still raging, and the outcome of the election would shape the future of the Union and the status of slavery. His victory signaled continued public support for the Union war effort and the eventual abolition of slavery through the 13th Amendment.

Karl Marx’s praise reflected a broader international interest in the outcome of the Civil War. Many in Europe saw the American conflict as a litmus test for the future of democracy and labor rights. Marx believed that Lincoln’s leadership represented a broader fight against aristocracy and slavery, which he viewed as systems of economic exploitation. His words weren’t just ideological—they also acknowledged Lincoln as a statesman who embodied perseverance and moral clarity.

The Letter from Marx to Lincoln

The letter Marx sent was addressed to Abraham Lincoln through Charles Francis Adams, the U.S. ambassador in London. Dated November 1864, it expressed the congratulations of the International Workingmen’s Association and included lines that directly acknowledged Lincoln’s standing among the working class. Marx wrote that Lincoln had “given the working classes of Europe a new sense of dignity and hope.”

Lincoln did not reply directly, but his ambassador acknowledged the letter warmly. This moment serves as a rare historical intersection between two iconic but ideologically different figures. While their political philosophies diverged, they found common ground in the pursuit of liberty, justice, and the dignity of labor.

A Man of the People

The description of Lincoln as a “single-minded son of the working class” speaks to his background and the persona he cultivated during his political life. Born into poverty in a log cabin in Kentucky and largely self-educated, Lincoln’s rise to the presidency came through personal perseverance and a strong belief in democratic ideals. His image as a self-made man resonated not only in the United States but also among observers abroad.

Lincoln’s humble origins and steadfast principles allowed people like Karl Marx to frame him as a figure emblematic of workers’ aspirations. Though Lincoln was no socialist, and Marx was no supporter of capitalism, both men believed in the transformative power of government and the importance of fighting systemic injustice.

The Jeopardy Tie-In: A Lesson in Context

This Final Jeopardy clue served as a reminder of how American history is intertwined with global thought. It pushed contestants—and viewers—to think beyond domestic narratives and consider how American leaders were perceived on the world stage. Abraham Lincoln is often remembered for preserving the Union and ending slavery, but clues like this show that his impact stretched far beyond U.S. borders.

The inclusion of this clue in Jeopardy! also demonstrates the show’s continued effort to highlight nuanced historical facts and lesser-known connections. By referencing Marx’s quote, the writers brought attention to a dimension of Lincoln’s legacy that is rarely discussed in textbooks but remains historically significant.