I’ve always been interested in dissents. Often they become the majority view years or decades later. Sometimes they are humorous; sometimes catty; sometimes sarcastic or even vicious; other times they ring so true simply because they are right. McLean’s dissent in the infamous Dred Scott decision is one of the right ones.
John McLean occupies a singular and somewhat contradictory space in American history as a figure who was simultaneously a pillar of the Supreme Court for over three decades and a perpetual seeker of the presidency. Born in New Jersey in 1785, McLean’s life began in extraordinarily humble origins, a sharp contrast to many of his colleagues on the bench who hailed from wealthy and established political dynasties. His family followed the typical path of the frontier, moving through Virginia and Kentucky before finally settling in Ohio in 1796. Because of this frontier upbringing, McLean lacked formal education for the vast majority of his youth, only beginning to study the classics at age sixteen. Despite these modest beginnings, his ascent was remarkably rapid. He apprenticed in a local court, studied law under notable regional figures, and eventually edited a newspaper before entering federal service. This self-made character defined much of his later jurisprudence and his tireless, if often criticized, ambition.
McLean’s political career was launched during the War of 1812 when he was elected to the U.S. House of Representatives at the age of twenty-eight. His administrative brilliance became evident early on, leading President James Monroe to appoint him Commissioner of the General Land Office and then Postmaster General. In this latter role, he transformed the postal service into a massive, efficient federal agency, but his principled stand against using the department’s vast appointment powers for political patronage brought him into direct conflict with Andrew Jackson. Jackson, frustrated by McLean’s refusal to fire competent postmasters to make room for political loyalists, famously “kicked him upstairs” to the Supreme Court in 1829. This appointment was less an honor and more a strategic maneuver by Jackson to remove a politically inconvenient but popular cabinet member from the executive branch.
Once on the bench, McLean remained a professional politician, a title that often shadowed his legal contributions. He was a perennial candidate for the presidency, seeking nominations from the Whigs, Anti-Masons, Free Soilers, and eventually the Republicans in nearly every election cycle between 1832 and 1860. His constant campaigning from the bench drew sharp rebukes from Chief Justice Roger B. Taney and others who believed it compromised the perceived neutrality of the Court. This political maneuvering was probably unparalleled in American history, as McLean frequently rationalized his political activities as being consistent with his judicial duty. Despite this distraction, McLean was an exceptionally hardworking justice, often traveling thousands of miles to fulfill his circuit court duties and writing hundreds of opinions that largely favored economic nationalism and federal power.
His judicial philosophy was deeply rooted in the belief that a strong national market was necessary for the country’s progress. He often clashed with the Taney Court’s states' rights leanings, particularly regarding the Commerce Clause. For example, he expressed a strong desire to protect vested property rights, arguing that the state should provide compensation for the loss of a franchise, reflecting his western perspective on the need for stable internal improvements. His personal life also reflected a complex set of moral values; though he often faced financial difficulties, he was known for his extensive acts of charity. Most notably, despite being in debt, he had purchased a family of slaves and emancipated them, and he later manumitted a servant in Washington rather than selling him for a significant profit.
This moderate antislavery stance reached its historic apex in the *Dred Scott v. Sandford* case of 1857. (For those not familiar with the case, I have a summary taken directly from McLean’s dissent in the appendix.) McLean’s role in this case was not merely as a dissenter but arguably as the catalyst for the broad, catastrophic ruling issued by Chief Justice Taney. When the Court initially considered the case, there was a possibility of a narrow ruling that would have avoided the larger constitutional questions of slavery in the territories and Black citizenship. However, McLean’s insistence on writing a full dissent that addressed these very issues forced the majority’s hand. Taney, wanting to settle the slavery question once and for all and perhaps hoping to undercut McLean’s potential 1860 presidential run, expanded his opinion to include the infamous declarations that Black people could never be citizens and that Congress had no power to ban slavery in federal territories.
The resulting dissents from McLean and Justice Benjamin Robbins Curtis provided the most significant judicial counter-narratives to the majority's opinion, though they approached the task with different focuses. Curtis provided a surgical, procedural dismantling of Taney’s logic, beginning with a challenge to the Court’s jurisdiction. He argued that if the majority truly believed the Circuit Court lacked jurisdiction because Scott was not a citizen, the Supreme Court had no authority to then rule on the merits of the case regarding the Missouri Compromise. Curtis’s most powerful historical contribution was his proof that African Americans were already citizens in five states—New Hampshire, Massachusetts, New York, New Jersey, and North Carolina—at the time the Constitution was adopted. He maintained that because these individuals were part of the “people of the United States” who ordained and established the Constitution, their descendants could not be categorically excluded from citizenship.
McLean, while supporting these jurisdictional points, focused more heavily on the principle of “positive law” and the collapse of judicial comity. He famously asserted that slavery is a local and municipal institution that can only exist by specific statute and does not follow a master into a free state. McLean was particularly scathing regarding the Supreme Court of Missouri’s decision to abandon its own twenty-eight-year-old precedent of “once free, always free.” He argued that rights to freedom that had vested for nearly three decades could not be repudiated with any semblance of justice simply because of a shift in local political sentiment. To illustrate this, McLean cited historical cases noting that once freedom vests by residence in a free jurisdiction, it cannot be reproduced by returning to a slave state.
The two justices also differed in their interpretation of the Constitution’s “Needful Rules and Regulations” clause. Curtis argued that the power to govern territories was a general one that necessarily included the power to prohibit slavery, a view supported by a long history of legislative acts beginning with the Northwest Ordinance. McLean went further, characterizing the majority's attempt to strip Congress of this power as a “Missouri question” that ignored the supremacy of federal law and the Illinois Constitution. He maintained that if a state court could disregard an act of Congress and the constitution of a neighboring sovereign state, then the laws afforded no protection to any human being. This foreshadowed much of the 14th Amendment in its application of the bill of Rights to the states and right and privileges and the due process clauses. While Curtis’s dissent was a masterpiece of constitutional history, McLean’s was a defense of the law of nations and the moral necessity of maintaining a distinction between freedom as a natural right and slavery as a legal exception.
Physically, McLean was an imposing figure, described as a large man with an air of authority that matched his long tenure. Brady took his photograph; he was certainly a dour-looking man, but then most of them were then.) in Yet, as a jurist, he was often seen as safe rather than brilliant, a man whose long experience in public affairs made him a reliable, if not revolutionary, judge. He died in April 1861, just as the Civil War broke out, serving as a living link between the era of the Founders and the violent resolution of the slavery crisis he had spent decades trying to navigate. Though his political ambitions often clouded his reputation, his dissent in *Dred Scott* remains a landmark in American law, representing a moderate but firm refusal to allow the highest court in the land to turn the entire nation into a slave-holding republic.
Sources:
Curtis, Benjamin R., and John McLean. Dred Scott v. Sandford: The Dissents. Compiled by Doug Linder, Famous Trials, 2026. [Text of the two dissents.]
Finkelman, Paul. "John McLean: Moderate Abolitionist and Supreme Court Politician." Vanderbilt Law Review, vol. 62, no. 2, 2009, pp. 519-566. [This is an excellent and very readable summary of McLean’s life and the Dred Scott decision and ramification.]
Weisenburger, Francis P. The Life of John McLean: A Politician on the United States Supreme Court. Da Capo Press, 1971.
Appendix:
From McClean’s dissent: The parties agreed to the following facts: In the year 1834, the plaintiff was a negro slave belonging to Dr. Emerson, who was a surgeon in the army of the United States. In that year, Dr. Emerson took the plaintiff from the State of Missouri to the post of Rock Island, in the State of Illinois, and held him there as a slave until the month of April or May, 1836. At the time last mentioned, Dr. Emerson removed the plaintiff from Rock Island to the military post at Fort Snelling, situate on the west bank of the Mississippi river, in the territory Known as Upper Louisiana, acquired by the United States of France, and situate north of latitude thirty-six degrees thirty minutes north, and north of the State of Missouri. Dr. Emerson held the plaintiff in slavery, at Fort Snelling from the last-mentioned date until the year 1838.
In the year 1835, Harriet, who is named in the second count of the plaintiff's declaration, was the negro slave of Major Taliaferro, who belonged to the army of the United States. In that year, Major Taliaferro took Harriet to Fort
Snelling, a military post situated as hereinbefore stated, and kept her there as a slave until the year 1836, and then sold and delivered her as a slave, at Fort Snelling, unto Dr. Emerson, who held her in slavery at that placeuntil the year 1838.
In the year 1836, the plaintiff and Harriet were married at Fort Snelling, with the consent of Dr. Emerson, who claimed to be their master and owner. Eliza and Lizzie, named in the third count of the plaintiff's declaration, are
the fruit of that marriage. Eliza is about fourteen years old, and was born on board the steamboat Gipsey, north of the north line of the State of Missouri, and upon the river Mississippi. Lizzie is about seven years old, and was born in the State of Missouri at the military post called Jefferson Barracks. In the year 1838, Dr. Emerson removed the plaintiff and said Harriet and their daughter Eliza from Fort Snelling to the State of Missouri, where they have ever since resided. Before the commencement of the suit, Dr. Emerson sold and conveyed the plaintiff, Harriet, Eliza, and Lizzie, to the defendant as slaves, and he has ever since claimed to hold them as slaves. At the times mentioned in the plaintiff's declaration, the defendant, claiming to be the owner, laid his hands upon said plaintiff, Harriet, Eliza, and Lizzie, and imprisoned them, doing in this respect, however, no more than he might lawfully do if they were of right his slaves at such times.
As in real estate, location, location, location. Illinois was a free state and Scott argued once free, always free. He lost , as did the Missouri Compromise, resulting in a major justification for the Civil War.