Liberalism (from the Latin liberalis) is a political ideology or worldview founded on ideas of liberty and equality. Liberals espouse a wide array of views depending on their understanding of these principles, but generally liberals support ideas such as constitutionalism, liberal democracy, free and fair elections, human rights, capitalism, and the free exercise of religion.

Liberalism first became a powerful force in the Age of Enlightenment, rejecting several foundational assumptions that dominated most earlier theories of government, such as nobility, established religion, absolute monarchy, and the Divine Right of Kings. The early liberal thinker John Locke, who is often credited for the creation of liberalism as a distinct philosophical tradition, employed the concept of natural rights and the social contract to argue that the rule of law should replace absolutism in government, that rulers were subject to the consent of the governed, and that private individuals had a fundamental right to life, liberty, and property.

Dennis Prager (born August 2, 1948) is an American syndicated radio talk show host, syndicated columnist, author, and public speaker. He is noted for his conservative political and social views emanating from conservative Judeo-Christian values. He holds that there is an "American Trinity" of essential principles, which he lists as E Pluribus Unum, In God We Trust, and Liberty.

Dennis Prager was raised in Brooklyn, New York. He attended Rambam, a Jewish day school and Yeshiva of Flatbush, where he met his future co-author Joseph Telushkin. He majored in Middle Eastern Studies and History at Brooklyn College, graduating in 1970. He went on to study at the Russian Institute (now Harriman Institute) at Columbia University.He speaks several foreign languages, including Russian and Hebrew.He taught Jewish and Russian History at Brooklyn College, and was a Fellow at the Columbia University School of International and Public Affairs, where he did his graduate work at the Russian Institute (now the Harriman Institute) and Middle East Institute from 1970-1972. He is a Media Fellow at the Hoover Institution of Stanford University. He is also the founder of Prager University, a virtual university aimed at educating people through five-minute videos on conservative political and social views.

Thomas Sowell (born June 30, 1930) is an American economist, social theorist, political philosopher, and author. A National Humanities Medal winner, he advocates laissez-faire economics and writes from a conservative and libertarian perspective. He is currently a Rose and Milton Friedman Senior Fellow on Public Policy at the Hoover Institution at Stanford University.

Sowell was born in North Carolina, but grew up in Harlem, New York. He dropped out of high school, and served in the United States Marine Corps during the Korean War. He received a bachelor's degree from Harvard University in 1958 and a master's degree from Columbia University in 1959. In 1968, he earned his doctorate degree in economics from the University of Chicago.

Sowell has served on the faculties of several universities, including Cornell and University of California, Los Angeles, and worked for think tanks such as the Urban Institute. Since 1980 he has worked at the Hoover Institution. He is the author of more than 30 books.

George Stanley McGovern (born July 19, 1922) is a historian, author, and former U.S. Representative, U.S. Senator, and the Democratic Party nominee in the 1972 presidential election.

McGovern grew up in Mitchell, South Dakota, where he was a renowned debater. He volunteered for the U.S. Army Air Forces upon the country's entry into World War II and as a B-24 Liberator pilot flew 35 missions over German-occupied Europe. Among the medals awarded him was a Distinguished Flying Cross for making a hazardous emergency landing of his damaged plane and saving his crew. After the war he gained degrees from Dakota Wesleyan University and Northwestern University, culminating in a Ph.D, and was a history professor. He was elected to the U.S. House of Representatives in 1956 and re-elected in 1958. After a failed bid for the U.S. Senate in 1960, he was elected there in 1962.

As a senator, McGovern was an exemplar of modern American liberalism. He became most known for his outspoken opposition to the growing U.S. involvement in the Vietnam War. He staged a brief nomination run in the 1968 presidential election as a stand-in for the assassinated Robert F. Kennedy. The subsequent McGovern–Fraser Commission fundamentally altered the Democratic presidential nominating process, by greatly increasing the number of caucuses and primaries and reducing the influence of party insiders. The McGovern–Hatfield Amendment sought to end the Vietnam War by legislative means but was defeated in 1970 and 1971. McGovern's long-shot, grassroots-based 1972 presidential campaign found triumph in gaining the Democratic nomination but left the party badly split ideologically, and the failed vice-presidential pick of Thomas Eagleton undermined McGovern's credibility. In the general election McGovern lost to incumbent Richard Nixon in one of the biggest landslides in American history. Re-elected Senator in 1968 and 1974, McGovern was defeated in a bid for a fourth term in 1980.

Milton Friedman (July 31, 1912 – November 16, 2006) was an American economist, statistician, and author who taught at the University of Chicago for more than three decades. He was a recipient of the Nobel Memorial Prize in Economic Sciences, and is known for his research on consumption analysis, monetary history and theory, and the complexity of stabilization policy. As a leader of the Chicago school of economics, he influenced the research agenda of the economics profession. A survey of economists ranked Friedman as the second most popular economist of the twentieth century behind John Maynard Keynes, and The Economist described him as "the most influential economist of the second half of the 20th century…possibly of all of it."

Friedman's challenges to what he later called "naive Keynesian" (as opposed to New Keynesian) theory began with his 1950s reinterpretation of the consumption function, and he became the main advocate opposing activist Keynesian government policies. In the late 1960s he described his own approach (along with all of mainstream economics) as using "Keynesian language and apparatus" yet rejecting its "initial" conclusions. During the 1960s he promoted an alternative macroeconomic policy known as "monetarism". He theorized there existed a "natural" rate of unemployment, and argued that governments could increase employment above this rate (e.g., by increasing aggregate demand) only at the risk of causing inflation to accelerate. He argued that the Phillips curve was not stable and predicted what would come to be known as stagflation. Friedman argued that, given the existence of the Federal Reserve, a constant small expansion of the money supply was the only wise policy.