Need help finding someone to interview? You might want to try looking for nonprofit groups who are interested in your policy issue, as well. Here are a couple of resources to help with that:
Researching your issue, and especially potential solutions to your issue, can be extremely helpful in developing interview questions. Most interviewees are also pleased (and sometimes flattered) to speak to someone who has clearly taken an interest in their particular knowledge. As you select potential persons to interview, spend some time looking around their company/organization website or looking through the local news for information about what they've been doing so that you can ask specific questions.