The Democratic Party is one of the two major contemporary political parties in the United States along with the Republican Party . Since the 1930s, the party has promoted a socially liberal and progressive platform, [ 2 ] [ 3 ] [ 4 ] and its Congressional caucus is composed of progressives , liberals , and centrists . [ 5 ] The party has the lengthiest record of continuous operation in the United States and is among the oldest political parties in the world. [ 6 ]
The modern Democratic Party is the descendant of the Democratic-Republican Party , an early-nineteenth-century political organization led by Thomas Jefferson and James Madison .