What the Fallacy?!
Composition/Division
The Definition
Assuming that what's true about one voter or small faction applies to the entire political party or nation.
The Explanation
This fallacy drives extreme partisanship by unfairly defining a large, diverse group by the actions of its most extreme or vocal minority.
Political Example
Because one protestor at the rally threw a rock, the opposing network declared that every single person who supports the cause is a violent anarchist.