It's not possible to make people understand. You can try it understand others, and some others can try to understand you, but you can't make someone's open their mind if they don't want to.
To help people understand something they've never experienced, stay within their own frame of reference. That's all they've got to work with, because they don't know what they haven't experienced.
To explain poverty to a middle class Californian, frame it in culture terms that are familiar, but which still reach the same class of emotional experience you want them to understand.
e.g.
Have you ever gone shopping at The Gap for jeans with a bunch of pals, and they take forever to decide which 12 pairs of jeans they're going to get, but you only take like 20 minutes because you can only afford 4 pairs? You know how that feels?
