A good worksheet created by the National Archives to help students to analyze a political cartoon in three different levels.
Source: Education Staff, National Archives and Records Administration
Original cartoon is from the Western Reserve Historical Society, this scanned .jpeg is from the book From Rail-Splitter to Icon: Lincoln's Image in Illustrated Periodicals, 1860-1865.
Source: From Rail-Splitter to Icon: Lincoln's Image in Illustrated Periodicals, 1860-1865
Source: From Rail-Splitter to Icon: Lincoln's Image in Illustrated Periodicals, 1860-1865