I think polling these days is all but useless just because a very small proportion of people actually respond to pollsters and it's next to impossible to statistically account for "what would the other 80% say if they did't tell the pollster to fuck off". There's no way to build a "representative sample" to account for that. People are way more likely to respond to a "friendly" pollster and if they don't know whether pollster is "friendly" (works for the organisation aligned with their party), they assume they are from the other camp. It's a mess.