Conservative and Republican ideologies intersect less and less these days

English mathematician, logician and philosopher John Venn introduced the Venn diagram in the 1880s. A Venn diagram uses overlapping circles to illustrate the logical relationships between two or more sets of items. Often, Venn diagrams serve to highlight how the items are similar and different. They can also help us visualize things in new ways and afford us the opportunity to make fresh observations.