WASHINGTON — The contentious and sometimes ferocious 2016 presidential campaign is coming to a head at the party conventions in Cleveland and Philadelphia, and the Secret Service is preparing for the very real prospect that they may be marred by violence.
The agency, according to its own statistics, has staffed more than 1,200 campaign events since November 2015. More than 2.5 million people have passed through magnetometers, and the head of the Secret Service has been wary.
