Call for Subjects for a Study

I'm redoing my last poll using some of the concepts I just learned in AP Statistics. I want to ensure that this poll is valid so I can make conclusions about the public opinion of manned space flight. To do this, I need a random sample from some pool of subjects. So, I'm asking anyone interested in participating in this study to sign up for it in the comments below. I'm going to offer at least 100 entrecard credits to those who are chosen to participate and links to all those in the subject pool, but you need to sign up now to participate. I'm going to give 10,000 entrecard credits (about 10 US dollars) to one subject.