Bernie Sanders, campaigning for president in Chicago, calls for change 'from the bottom up'

CHICAGO - Speaking to a crowd of more than 12,000 people at Chicago's Navy Pier, independent Vermont Sen. Bernie Sanders on Sunday described a pivotal moment in his political development that happened about 55 years ago when he was a student at the University of Chicago.

Sanders, who transferred to the elite school, was arrested in 1963 while protesting the squalid conditions of mobile trailers that the city provided to reduce overcrowding at South Side schools instead of integrating black students with their white peers.