I was thinking about it a bit. I think all of the major assassination attempts of federal or national people have been by leftists
Lincoln — Democrat shooter
T Roosevelt — some sort of commie, but mainly crazy
Hoover -— anarchists bombers
McKinley — anarchist (?)
J Kennedy — communist
R Kennedy — pali arab commie
Martin Luther King — George Wallace supporter
Ford (attempts) — environmental wacko was one. I think there were two.
Reagan — leftist loonie
Congressional Baseball — Bernie Bro Democrat
Trump — leftist
Trump — leftist
There was some kind of mail bomber that went after Soros, Clinons, Obama that was a right-winger, but I think that’s it.
You left out Garfield. His assassin Guiteau was ostensibly a Republican but one with mental problems. His family tried to get him committed in 1875. He convinced himself he got Garfield elected and deserved appointed office. When that didn’t happen he snapped.