|Ronald Reagan, 38th President of the United States|
"The personal attacks against me during the primary finally became so heavy that the state Republican chairman, Gaylord Parkinson, postulated what he called the Eleventh Commandment: Thou shalt not speak ill of any fellow Republican. It's a rule I followed during that campaign and have ever since."
"Reagan followed this 'commandment"' during the first five primaries during the 1976 Republican primary against incumbent Gerald Ford, all of which he lost. He abandoned this approach in the North Carolina Primary and beat Ford 52–46, regaining momentum and winning a majority of delegates chosen after that date. Some analysts credit Reagan's attacks as seriously to have weakened Ford in his contest with his general election opponent and eventual successor, Jimmy Carter"
Wilcox, David C. (8 April 2002). "The "Eleventh Commandment"". Enter Stage Right. http://www.enterstageright.com/archive/articles/0402/0402eleventhcommandment.htm. Retrieved 15 September 2010. Reagan, Ronald Wilson. An American Life, Simon and Schuster, 1990, p. 150