The meme that right-wing propaganda creates far more political partisan's than left-wing propaganda is laughably absurd.
I've witnessed this very phenomenon in my own family, except ours went from moderate "blue dog" Democrat to unhinged moonbat. Not quite randys1 or TMN levels, but it's been trending that direction for the last 5 - 10 years. I figure some of it's related to an aging mind, but most of it's due to spending WAY too much time on left-leaning websites.