Yes, he was in a political party
The Democratic-Republican Party, led by Thomas Jefferson and James Madison, opposed the creation of a national bank in the late 1700s and early 1800s. They believed that a national bank would give too much power to the federal government and favored a more limited role for the central government.
Thomas Jefferson
Jefferson's party was known as the Democratic Republicans.
thomas jefferson
In the US political parties were founded by Thomas Jefferson and Alexander Hamilton with the Democratic Republican and Federalist Party
democratic republican
democratic republicthank: billy rogers
democratic-republican
Democratic-Republican Party formed by Thomas Jefferson
James Madison and Thomas Jefferson started the Democratic-Republican party (but they just called it the Republican party). They created the Republican party to oppose the Federalist party. The Republican party that they created was the second political party in the United States.
The Democrats. Jackson's Democrats, not Jefferson's.
The oldest political party is the Democratic Party. Thomas Jefferson and James Madison established it in the 1790s. The Democratic Party formed to oppose the Federalist Party's policies.