Elizabeth Ann Warren is an American politician and former law professor who is the senior United States senator from Massachusetts, serving since 2013. A member of the Democratic Party and regarded as a progressive, Warren has focused on consumer protection, equitable economic opportunity, and the social safety net while in the Senate. Warren was a candidate in the 2020 Democratic Party presidential primaries, ultimately finishing third.

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."