John Karl Fetterman is an American politician serving as the junior United States senator from Pennsylvania since 2023. A member of the Democratic Party, he served as the mayor of Braddock, Pennsylvania, from 2006 to 2019 and as the 34th lieutenant governor of Pennsylvania from 2019 to 2023. Although he has since renounced the label, Fetterman was formerly described as a progressive, and advocates healthcare as a right, criminal justice reform, abolishing capital punishment, raising the federal minimum wage to $15 per hour, and legalizing cannabis.

Progressivism in the United States is a political philosophy and reform movement. Into the 21st century, it advocates policies that are generally considered social democratic and part of the American Left. It has also expressed itself with right-wing politics, such as New Nationalism and progressive conservatism. It reached its height early in the 20th century. Middle/working class and reformist in nature, it arose as a response to the vast changes brought by modernization, such as the growth of large corporations, pollution, and corruption in American politics. Historian Alonzo Hamby describes American progressivism as a "political movement that addresses ideas, impulses, and issues stemming from modernization of American society. Emerging at the end of the nineteenth century, it established much of the tone of American politics throughout the first half of the century."