Unclassed choropleth maps are good way to transcend the dilemma of division of the data into intervals. Instead, there is a continuous spectrum within which data values can fall. There are as many intervals as there are areal units in these types of choropleth maps. The map above is an unclassed choropleth map depicting the results of the 2008 presidential election. A high percentage of Democrat voters in a county would make the county a color close to blue and a high percentage of Republican voters would make the county look more red. A purplish hue results when neither Republican nor Democrat voters dominated. Representing the data in this way is a reminder that not all people in "blue states" vote Democrat and not all people in "red states"vote Republican.
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