Hear what former prisoner Shaka Senghor, who was incarcerated for 19 years and now directs strategy for the bipartisan initiative #cut50, has to say about President Obama's recent pledge to end solitary confinement for juveniles and low-level offenders. Senghor shares his insights from seven years in solitary in one of the nation's most violent prisons. Since 1980, the number of people incarcerated in the United States has more than quadrupled; the US now has the largest prison population in the world.