U.S. senator Stephen
Arnold Douglas (1813-1861), the foremost leader of the Democratic party in the decade
preceding the Civil War, was Lincoln's political rival for the presidency. Although
they differed when it came to the issue of slavery, Douglas struggled along with
Lincoln to preserve the Union. (More
"Stephen Arnold Douglas." Dictionary of American Biography. New York: Charles Scribner's
Sons, 1936. Gale U.S. History In Context. Web. 15 Nov. 2011.