Of course, one must look at the wording of questions used in polls. But polls, whatever their ultimate use, are scientifically reflective of whatever they are trying to measure.
I am speaking, of course, of polls done by professional polling firms, and not the idiotic internet variety which are basically used as a vehicle for web hits.
Professional polling firms such as Public Opinion Strategies? Bob Barr might not agree. (Second article down: From the Trail)