There were 4 presidential assassins whose politics we know who actually assassinated a president. John Wilkes Booth-Democrat (President Lincoln), Charles Guiteau-Communist (President Garfield), Leon Czolgosz, liberal anarchist (President McKinley), Lee Harvey Oswald, communist (President Kennedy).
There were also 7 failed presidential assassinations whose politics we know and were also liberals. You can read them in the article.
The only such person whose ideology seemed to come from the ‘right’ was Francisco Martin Duran. He claimed incitement by a conservative talk show host but he had a clear break with reality feeling he was saving the world from aliens.
The current attempt at our president’s life is a ricin laced envelope that was addressed to the president. The perpetrator is a liberal.
Bet you won’t see this on the evening news with Brian Williams.