There are several U.S. politicians named John Brown:
John Brown (1757-1837), was a member of the Continental Congress from Virginia and a Representative and Senator to the U.S. Congress from the state of Kentucky
John Brown (????-1815), was a Representative to the U.S. Congress from the state of Maryland
John Brown (1737-1812), pioneer and statesman from North Carolina
John Brown (1772-1845), was a Representative to the U.S. Congress from the state of Pennsylvania
John Brown (1736-1803), U.S.Congressman from Rhode Island
John Brewer Brown (1836-1898), was a Representative to the U.S. Congress from the state of Maryland
John C. Brown (1827-1889), was Governor of Tennessee
John Robert Brown (1842-1927), was a Representative to the U.S. Congress from the state of Virginia
John W. Brown (1796-1875), was a Representative to the U.S. Congress from the state of New York