Protesters, Bike Mounted Police Face Off In Boston, MSNBC

Bikemounted police in Boston, attempting to enforce crowdcontrol, are pelted with water bottles, a traffic cone and a trash can. Subscribe to MSNBC: MSNBC delivers breaking news, indepth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, Meet the Press Daily, The Beat with Ari Melber, Deadline: White House with Nicolle Wallace, Hardball, All In, Last Word, 11th Ho