I agree that you can't always depend on polls, but if the right questions are asked, in the right way, to a wide range of people, that the "can" be fairly accurate.
I am also sure that all politicians DO pay attention to polls even if they claim they don't. Even though it may not be 100 per cent accurate, it is one way to monitor what the public feels. To depend totally on them isn't smart but on the other hand, for a politician to totally disregard all of them might not be too bright either.
TIS