Last-minute polls often produce different results from earlier polls. What is the best reasoning behind this?

Question

Quizplus · Accepted Answer

An increase in sampling errors is the most probable reasoning why last-minute polls often produce different results from earlier polls. Closer to a voting deadline, polls tend to have large problems such as skewed responses or rushed data, as people are being forced to make a decision or produce results. Larger numbers, questions, or controls are usually not really at stake-even in last-minute polling.

Last-Minute Polls Often Produce Different Results from Earlier Polls