Check out Tom Carson's book Lying and Deception (Notre Dame University Press). It's brilliant. I am not sure why you are leaning to equate lying and advocacy. Maybe you have in mind the idea that when persons advocate for a cause or person they might be tempted to do *anything* on behalf of the cause or person. I will admit (and hope that my college administration is not reading this) that my advocacy on behalf of some students has led me to "stretch the truth" a bit (or lie), but this is rare! Check out Carson's book. It is brilliant.