How to know whether you can trust a poll

A close election is all about uncertainty. So it's not surprising that many Americans are relying on polls to offer comfort, or warning. Not all polls are created equal, however — and election experts caution that some are more impartial than others. Not only that, pollsters vary wildly in their level of outreach, and how much they adhere to industry norms regarding data accuracy.Take this poll released Wednesday by Quinnipiac University, which says Vice President Kamala Harris was ahead o