Ok Nitrox, I apologize for construing this as a reflection on you personally as an American. (That is, unless you tolerate anyone who advocates political assassination, no matter how nuanced.)
Your little leftist/communist story is unsurprising. I haven't heard that kind of denialist spin yet, though I haven't been tuning into Fox either. It is possible, as you maintain, that this murderer was never exposed to or influenced by the recent propaganda campaign insinuating the killing of politicians, despite the best efforts of the powerful and well-funded political and media groups that produced them. I think this is unlikely, but you are welcome to your opinion. Regardless, what happened today underlines the immense moral and ethical hazard of advocating violence as a campaign strategy.
May there be a God to protect her and reward her for her service, since nobody else could. Let us pray that this does not happen again--if you're the passive type. Otherwise, let's honor her by peacefully but vigorously opposing any and all political figures, ideologies, and media organizations that encourage this kind of tragedy. It's for real now.