“Communism and socialism can be connected to a single major author—Marx—and assessed as deviations from, and implementations or negations of, Marx. Democracy is not amenable to a similar treatment; the towering, single major author on democracy does not exist.”
The Theory of Democracy Revisited (1987), 1. Can Democracy Be Just Anyting?
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Giovanni Sartori 3
Italian journalist and political scientist 1924–2017Related quotes

The Public Square, by Richard John Neuhaus, First Things 1996
1990s

Source: 2000s, The Age of Turbulence (2008), Chapter Twelve, "The Universals of Economic Growth", p. 265.

“Socialism is the completion of democracy, not the negation of it.”
Source: 2010s, Why Marx Was Right (2011), Chapter 9, p. 202
Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), pp. 60-61

The earliest known attribution of this quote was December 9, 1951, in what appears to be an op-ed piece in The Daily Oklahoman under the byline Elmer T. Peterson, [This is the Hard Core of Freedom, Elmer T. Peterson, Daily Oklahoman, 9 December 1951, 12A]. The quote has not been found in Tytler's work. It has also been attributed to Alexis de Tocqueville.
There are many variants circulating with various permutations of majority, voters, citizens, or public. Ronald Reagan is known to have used this in speeches, as reported in Loren Collins, "The Truth About Tytler http://lorencollins.net/tytler.html":
Other variants:
The American Republic will endure until politicians realize they can bribe the people with their own money.
The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money.
Attributed

“In a democracy, thumping majorities prevail.”
“Planet Facebook Owns It,” http://www.ilanamercer.com/phprunner/public_article_list_view.php?editid1=652 WorldNetDaily.com, May 25, 2012.
2010s, 2012
Source: Sailing the Wine-Dark Sea: Why the Greeks Matter (2003), Ch.IV The Politician and the Playwright: How to Rule

Source: The Third Wave: Democratization in the Late Twentieth Century (1991)

Waldersee in his diary c. 1886, quoted in John C. G. Röhl, The Kaiser and his court : Wilhelm II and the government of Germany