I just got the call and am listening in on a Tom Campbell Teletown Hall. It seems like most of the questions are coming from seniors.
If you are not familiar with Teletown Halls, they function like talk radio but works over the phone lines. They call out to thousands of households at one time and they can all listen in and some people can ask questions, the operator can take polls of people on the call and people can leave messages for call back or follow-up.
Based on the people and the talk, it seems that the call is largely including Orange County voters.