This week on Matter of Fact, social media is giving rise to political candidates that don’t need the establishment’s blessing. Soledad O’Brien speaks with Republican strategist Bruce Mehlman about the potential downsides. Plus, how immigration how shaped New England’s first minority-majority city. And, military burn pits have been called the Agent Orange of our generation. Soledad speaks with Bonnie Carroll, founder of TAPS, and Coleen Bowman, whose husband died after being exposed to toxic fumes from the pits.