January 30, 1933. Hitler becomes Chancellor of Germany. The next few months break every conventional model of party-growth. Wilson reports: "Just since Hitler had become Chancellor, 1.6 million Germans had joined the NSDAP." Sixteen-hundred-thousand new members in roughly twelve weeks. Not because the party changed its platform. Not because membership requirements relaxed. Not because organizational outreach increased dramatically. Because Hitler held formal power and power attracts power.1
Wilson cites Osama bin Laden's articulation: "When people see a strong horse and a weak horse, by nature they will like the strong horse."1 The framing is uncomfortable. The framing is correct. People who had been politically agnostic for years now found National Socialist commitments inside themselves they hadn't previously detected. Conservatives who had distrusted Hitler in November 1932 found him acceptable in February 1933. Bureaucrats who had quietly mocked NSDAP rhetoric now found themselves drafting documents in NSDAP language. The shift was not deceit; the shift was real updating in response to power. Once Hitler demonstrated power, the population shifted around it.
The capture: the strong-horse principle is the cheapest and most-effective recruitment tool a movement has. Demonstration of power produces self-recruitment. The work the movement was doing before — convincing, persuading, marketing — was expensive and slow. The work after demonstrating power was nearly free because people came to it on their own. The principle is morally uncomfortable (it implies that much of what we call "principled support" is actually power-attraction in disguise) but operationally undeniable.
First wire (obvious): People like winners. Available in any sports-fan literature.
Second wire (deeper): The strong-horse effect operates at demonstrated-formal-power threshold. Mere reputation or rhetoric doesn't trigger it. The 1.6 million NSDAP joiners did not join based on Hitler's eloquence or platform; they joined because Hitler had formal power as Chancellor. The trigger is the institutional position, not the persuasiveness. This means movements have a step function in their recruitment curve: slow growth until they cross the formal-power threshold, sudden mass-recruitment after. Most movement-strategy underestimates this because the pre-threshold growth metrics don't predict the post-threshold growth.
Third wire (uncomfortable): Most people I know would tell themselves they would not be among the 1.6 million who joined the NSDAP in early 1933. They would say their commitments don't update with the wind. The strong-horse principle predicts they're probably wrong. Power-demonstration triggers something close to involuntary updating in most people. The principled stance is rare and usually doesn't survive seeing the strong-horse win consistently. The implication for self-knowledge: my current commitments may be more contingent on my-current-environment's power-distribution than I realize. I cannot know which commitments I would retain if the power-distribution shifted decisively against them.
The wire that holds: the third one. Strong-horse principle is descriptive of how my own commitments would update if I'm honest, not just descriptive of how other people's commitments updated in 1933.
Cross-domain reach:
Spark to develop carefully. The principle is morally uncomfortable and easily misused as cynical-power-celebration. Responsible development requires holding both the operational reality (it works) and the moral implication (most "principled support" is reverse-engineered from power-distribution) without collapsing into either nihilism or naïveté.
Possible essay path: an article titled "Strong Horse: The Recruitment Tool Most Movements Don't Realize They're Using". The piece would distinguish strong-horse-recruitment from rhetoric-recruitment, show that movement-strategists who optimize for the former substantially outperform those who optimize for the latter, and argue that recognizing this is the first step to either deploying it deliberately (if your cause is good) or defending against it (if a bad-cause is deploying it on you).
Open question: Are there cases where strong-horse-recruitment produced temporary mass-joining that did not survive subsequent reversals? The NSDAP held its 1.6 million new members through 1945; many later expressed regret but few defected during the regime. Do other strong-horse-recruited mass-joinings show different durability? If yes, what differentiates durable from temporary recruitment?