Tracking polls are useful for evaluating changes in attitudes overtime. A simple yet effective approach is to plot the percentages of people responding in one of two ways each time you collect data.
In the example from the Washington Post-ABC News poll, the pollsters collected opinions of the public on the way the president was handling the coronavirus outbreak. By connecting the data points with different colored lines, the change is evident at a quick glance.
If you are interested in this particular subject, see the article by Clement and Balz,
The Washington Post, July 17, 2020.
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