In the 2004 election, one of the phones at GOP headquarters in Lansing was called. I was right there when it happened. We had fun with that one.
If there is anything I learned on FR is that polls are only useful for measuring current trends. With straight ticket voting at an all time high today, past elections results are the best predictors.
Haven't you ever heard of "Random Digit Dial"?
SurveyUSA's polls use RDD sampling. Business numbers are excluded, but campaign headquarters are usually so recently established that their numbers aren't in the business phone book yet and they therefore have a nonzero probability of being called.
Most major pollsters use RDD because voters with unlisted numbers can still be reached.