For those who don't want to squint, here is the relevant snippet:
“All 50 States are coordinating in this – as we fight back against our own Right-Wing Domestic Terrorists who are subverting the American Democratic Process, whipped to a frenzy by their Fox Propaganda Network ceaselessly re-seizing power for their treacherous leaders.”
Very likely this was a user-generated page rather than a staff-created page, meaning that the once it was pointed out to them Obama staffers removed the material. But they did so by essentially denying it ever existed, as you will find if you click this link:
The URL you clicked references an event that does not exist. This event may have existed at one time but been subsequently deleted.
I've noticed this tendency on Organizing for America before: at one point there was a graphic appearing above the main pages of an Obama 2012 campaign logo that I wanted to blog about, but twenty minutes later it was ... gone.
I don't doubt that there are lot of Obama supporters who see their political opposition as traitors [Paul Krugman, for example], un-American [Nancy Pelosi] or terrorists, just as there are plenty of nuts on the so-called opposition side of the Demopublicans that consider Obama to be a socialist, a foreign-born Muslim, or a terrorist.
But you don't deal with these folks on your own side by pretending they don't exist, while meanwhile lambasting your political opponents.