Thank you for that excellent explanation. Is it the same with other polls?
The annual CPAC straw poll gets a fair amount of press coverage. It is also swayed by candidates paying for students (cheap tickets) to attend and sway the vote in their favor. Ron Paul and Mitt Romney have been doing this for several years.
Telephone surveys/polls may or may not be paid by special interest groups and/or candidates. The special interest slant can often be detected by the phrasing of questions and/or response choices. Known liberal pollsters can also skew results by heavily populating the sample with known liberal respondents.