The challenge of protecting members of Congress

Article/Op-Ed in CNN
June 14, 2017

Julian Zelizer wrote for CNN about the congressional baseball shooting and the vulnerability of elected officials:

Wednesday's horrific shooting at a Republican congressional baseball practice in Virginia could have been even more devastating had the Capitol Police not acted in such heroic fashion. 
This is not the first time there have been violent attacks against members of Congress, who historically receive far less protection than the president. The presence of Capitol Police on the scene apparently was due to the fact that one of those taking part, Rep. Steve Scalise, is the House majority whip and receives added protection as a member of the House leadership.