washington u.s. democratic presidential candidate hillary clinton call high trade standards saturday campaign stop youngstown ohio ensure automakers use largely foreign part give preference produce make america cars campaign say clinton tell supporters take stand weak rule origin say pending trans pacific partnership trade compact 12 nations stringent enough tpp finalize obama administration set content threshold make america cars 45 percent clinton say oppose tpp enough protect u.s. workers international trade deal become flash point u.s. presidential race clinton call strict 'rules origin ohio campaign stop