washington television advertisement set air tuesday presidential campaign hillary clinton underscore democratic front-runner willingness take predatory drug price accord campaign statement ad set run nominate contest follow super tuesday vote title `` predatory `` show clinton criticize valeant pharmaceuticals international inc vrx.to price practice make clear will take step end accord hillary america valeant share fell much 21 percent monday canadian drugmaker reveal investigation u.s. securities exchange commission also investigate u.s. attorneys new york massachusetts report eric walsh edit clarence fernandez article fund part sap independently create reuters editorial staff sap editorial involvement creation production clinton campaign say tv spot show commitment fight predatory drug price