Of course they're not - they're accurate to a specific error (the exact number varying based on the number of people polled and the methodology, but usually around +/- 2%) to a specific degree of confidence (usually 95%).
thing is you might get completely different results if you go to a different area. thats what kills me about politcal polls, I never see any around where I live. but go into the city, you'll see them. i'm sure some polling places are better about making sure they cover a variety of demographics, but it doesn't always happen. some i'm sure intentionally skew the results by focusing on one area. its why I never really trust it. not to mention all the people who just refuse to take them. the few times say my mom when I was growing up got a survey over the phone done for a poll she'd usually hang up on them unless they offered money (some have. usually like 5 bucks)
a Podunk town doesn't represent the views of the majority, if you want to be polled - move, ok? ---