True but what the poster said is important: polls do not work well in close races because they don’t sample correctly. The average poll respondent is older, whiter, and more conservative than the average voter. So you end up with a skewed sample. Plus you sample so few of the other voters that you can’t make a guess as to what they think.
No younger people answer the phone for pollsters, so this is hard to fix. They are probably going to have to start paying people to answer surveys. I know I won’t answer them for 15 or 20 minutes for free.