What are three factors that scientifically constructed polls have difficulty accounting for?

Scientifically constructed polls often struggle to account for sampling bias, where certain Demographics may be underrepresented or overrepresented, leading to skewed results. They also face challenges related to respondent honesty, as individuals may provide socially desirable answers rather than their true opinions. Additionally, polls can be affected by the timing of the survey, as public opinion can fluctuate significantly in response to current events or media coverage.