new york late 2016 presidential debate hillary clinton bernie sanders draw audience 5.6 million tv viewers cnn say friday recent democratic debate thursday debate air live brooklyn saw front-runner clinton bernie sanders challenge judgment experience ahead tuesday crucial nominate contest new york clinton sanders attack wall street gun control issue thursday series exchange lay bare mount pressure seem unlikely change dynamics race cnn say thursday debate rank 7th among democratic debate presidential cycle audiences republican debate generally twice high democratic contenders clinton sanders democratic debate draw 5.6 million viewers cnn