Any type of poll could use a Venn diagram. For instance with the election, one cell for Obama, another for Romney and the intersection would be undecided
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Venn diagrams are used for comparing more that two items in a chart. A Venn diagram compares like possibilities of a group of related objects or things. A family tree is a type of Venn diagram.
The answer depends on the Venn diagram.
Venn diagrams were conceived around 1880 by John Venn.
John Venn
A Venn diagram or a set diagram is a diagram that shows all possible logical relations between a finite collection of sets.