The 1864 United States presidential election in Illinois took place on November 8, 1864, as part of the 1864 United States presidential election. State voters chose 16 representatives, or electors, to the Electoral College, who voted for president and vice president.
Illinois was won by the National Union candidate incumbent Republican President Abraham Lincoln of Illinois and his running mate former Senator and Military Governor of Tennessee Andrew Johnson. They defeated the Democratic candidate 4th Commanding General of the United States Army George B. McClellan of New Jersey and his running mate Representative George H. Pendleton of Ohio. Lincoln won his home state by a margin of 8.84%.
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