From The Washington Post:
The FBI identified Thomas Matthew Crooks, 20, of Bethel Park, Pa., as the suspected shooter at former president Donald Trump’s rally. The FBI, which called the attack an assassination attempt, said it was trying to determine his motive and asked the public to come forward with anything they know about Crooks. The shooter was killed. Crooks was a registered Republican, according to the state’s voter status records.
This doesn't sound like a politically motivated assassination attempt. Sounds more like an unbalanced loser who was able to get a gun. More John Hinckley, less John Wilkes Booth.
I'm somewhat relieved, because I figured the shooting would put us on the brink of a second Civil War. Maybe it still will. A lot of people seem to want that.