Shooting at White House Dinner Sparks Concern
Suspect Cole Tomas Allen, 31, of Torrance, CA, referred to self as 'Friendly Federal Assassin'.
Suspect traveled by train from California to Washington before shooting.
1981 Reagan shooting occurred at same hotel, linking it to political violence history.
Security is more robust than in 1981, but tensions remain between politicians and the public.
5 hours ago