In reply to You.

Hillary wasn't winning in the polls in the weeks leading up to election day. I am speaking of the average of the major polls for the each state in the electoral college, not the popular vote poll. You shouldn't rely on polls on an individual basis, in order to make a decent prediction you have to be certain that you are frequently checking the electoral college polling averages (so called "poll of the polls") for each state. Polls can be helpful but only if you are considering the date-range of the poll, whether the pollster is left or right leaning, and comparing individual polls to the average of the polls put together (available on real clear politics). Hillary's average electoral college polls were dropping like hot potatoes after the stupid Comey email announcement. In many of the states that she was previously leading in, the polling averages showed her either within the margin of error or losing to Trump. Anyone frequently checking the polls in the right way knew that she would likely lose the electoral college (considering the rate of her falling polling averages) but win the popular vote. I'm not saying that Biden's poll positions will remain stable but all we can do is go by the information that is currently available and keep checking for changes.