The problem with polls is they only show, assuming they are accurate, what percentage of people will vote a certain way. They don't indicate who will win. Due t

The problem with polls is they only show, assuming they are accurate, what percentage of people will vote a certain way. They don't indicate who will win. Due to the electoral college, many votes are effectively thrown out. This is the reason for the discrepancy. It would increase democracy in the US if the electoral college was eliminated. FiveThirtyEight.com uses polling data, but also looks at the electoral college, and accurately predicted that Trump could beat Hillary and that Biden could beat Trump, although the odds that Trump would beat Hillary were low, they did predict it was possible.