But this isn't at all likely. For one thing you probably have a limited number of family and friends who highly trust your opinions, so your effectiveness (i.e., derivative of success) at convincing people on any given political issue will start out high and quickly take a dive as you spend more time on that issue.

I'm inclined to agree. A variant of the strategy would be to spend a lot of time arguing for other positions that are carefully selected to agree with and expand eloquently on the predicted opinions of the persuasion targets.