The Democratic Party swept the 1862 election . They passed resolutions denouncing the federal government 's conduct of the war and urging an immediate armistice and peace convention in the Illinois House of Representatives , leading the Republican governor to suspend the legislature for the first time in the state 's history . In 1864 , Republicans swept the state legislature and at the time of Lincoln 's assassination , Illinois stood as a solidly Republican state
Lincoln 's assassination
Assassination of Abraham Lincoln
Illinois General Assembly