What should we make of the self-appointed spokesperson?

More at https://www.philosophytalk.org/shows/who-speaks-you. People often speak on behalf of others, like the concerned citizen who stands up for their neighbors at a city council meeting, or the activist who defends the rights of an oppressed group. Some of these spokespeople are elected, and some volunteer, but others simply get drafted into the role. What gives someone the right to speak on behalf of others? What responsibilities do they take on when they do? And how should the rest of us respond to what they say? Josh and Ray speak for themselves with their Stanford colleague Wendy Salkin, author of "Speaking for Others: The Ethics of Informal Political Representation."