I don’t like this from their website:
“If you’d like to inquire about participation, you can do so by contacting us through email. We are looking to expand our panel with those who are willing to conduct repeat interviews, are of age, eligible to vote and are qualified via a screening questionnaire. Include contact information, as well as zip code and/or city and state.”
Sample
All responses in the sample should be treated as “opt-in Internet panel” even though a percentage of respondents were specifically targeted based on registration status (more on that below in population). They are still ultimately considered opt-in and we do NOT treat them as a random sample. Respondents either received a mailer, an email, responded to social media ads or a website-based ad, or contacted us through another mode.