As a product of the quiet 50′s and then the chaotic 60′s, I saw rapid change with lots of national anger and dissatisfaction. My view of advocate was a protester with their fist in the air, yelling for justice. It may have been one description, at one time, but in my mind it is a more powerful description today.
To care enough about people or a condition to facilitate knowledge, change, and improvement is what I think an advocate is today. Here is the Encarta English Dictionary definition(s):
Living with a condition or disease can turn you into an advocate, especially if you care to make this world a better place. That’s what happened to me. Here I will tell you my story so that you might become one as well.