A poll that measures changes in public opinion over time is known as a

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A tracking poll is specifically designed to measure changes in public opinion over time, whereas the other options have different purposes. A straw poll is an informal poll that doesn't have a scientific methodology; a Gallup poll is a type of scientific poll conducted by the Gallup organization; a push poll is a type of survey that aims to influence rather than measure public opinion; and an exit poll is conducted outside a voting booth to predict election outcomes.

A Poll That Measures Changes in Public Opinion Over Time