Well, certainly, if the Secret Service remains like it was last summer, Trump is a sitting duck. However, last year's shakeup of the agency is bound to have brought improvements unless some imbeciles remain in charge.
A neo-nazi kid being part of the left? Hatred I can see but the lefties aren't going to have much trouble disavowing this one. Rather, they'll try to spin it to say that even Trump's own support base can't stand him either.
I wonder what the FBI is going to do with the co-conspirators in this case...