Use the interview to ask for the personal side of an issue that you may not be able to find in other resources. Personal narratives about experiences can resonate with an audience.
I really like this point. When people listen to facts or statistics it may be hard for them to connect to the material. However, when people listen to someone tell a story they can be sucked in and feel an emotional connection. I think especially when giving a persuasive speech, having a personal account of someone connected to the topic can help you influence your audience.