Which reasoning error is illustrated by the chairman's prediction about the Democrats winning the Presidency?

The reasoning error illustrated by the chairman's prediction about the Democrats winning the Presidency is an example of selected instances. This type of error occurs when conclusions are drawn based on a limited or non-representative set of data points rather than more comprehensive evidence. For instance, if the chairman points to recent victories or favorable polls but ignores other significant factors such as the overall political climate, historical trends, or contradictory evidence, he may create a misleading or overly optimistic prediction.

In propaganda and political discourse, relying solely on selective instances can lead to a skewed portrayal of reality, appealing to emotions or biases rather than providing a balanced assessment. This can misinform audiences and influence perceptions based on incomplete information. Selected instances can make a situation appear more favorable (or unfavorable) than it truly is, and that is why this reasoning error fits the scenario described.