Again, I don't think he did this.
I think the media did it, both by spouting lies and refusing to report his background.
I don't think he convinced them to do this; I think they wanted a far-left politician and would have used a brick wall if that's all they had to work with.
I think you grant the media much more power than they actually have. If they were as "all-powerful" as you claim, we never would have elected Ronald Reagan. They were dead-set against him and they were more powerful in the 1980's than they are now, when they are widely perceived as a laughing-stock.