Public opinion serves as a cornerstone of the democratic process in the United States, often shaping the political landscape. One method by which public opinion can be gauged is through polling. However, not all polls are created equal. Some polls may employ methodologies that introduce bias or fail to accurately reflect the views of the population.

Consider a recent scenario where a national poll aiming to gauge public support for a controversial piece of legislation reported that 65% of respondents were in favor. Critics of the poll argued that its sample was not adequately representative of the population's demographic diversity. This raises important questions about how public opinion is measured and interpreted.

Which of the following statements best reflects a significant issue related to the validity of public opinion polls in relation to this scenario?