The right-wing effort to avoid blame for violence, which we certainly see at work in these comments--by saying extremists on the left and the right are equally guilty of inflammatory and murderous rhetoric--is completely dishonest.
There is no prominent figure on the left equivalent to Ann Coulter, who has said that a baseball bat is the most effective way to talk to liberals, and who has said that the real debate about Bill Clinton should not have been whether to impeach him, but whether to assassinate him, and whose only regret about the Oklahoma City bombing was that McVeigh did not set off his truck bomb in front of the New York Times building.
There is no prominent figure on the left equivalent to Bill O'Reilly who has said that liberal bloggers should be dealt with with a hand grenade, that liberal talk show hosts should be put in chains, and suggested that al Qaeda attack San Francisco.
There is no prominent figure on the left equivalent to Glen Beck who jokes about poisoning Nancy Pelosi, compares Al Gore to Hitler, and equates immigration reform with burning American citizens alive.
There is no prominent figure on the left equivalent to talk show host Michael Savage who thinks "smallpox in a blanket" (which he says, without a hint of disapproval, that we used against Cherokees) is actually too good for liberals.
There is no prominent figure on the left equivalent to Rush Limbaugh who jocularly advocates killing all but two liberals on every campus, leaving those two as a reminder.
Limbaugh and all the rest of them, when called on such stuff, will become indignant and say "Can't you liberals recognize political humor? I was just (nudge, nudge, wink, wink) 'joking' after all."
So basically we have the following situation: Republican extremists advocate, overtly or by suggestion, the killing of people they disagree with. Liberals reply, mildly, as liberals do, "you shouldn't be saying stuff like that." Republicans then declare, "Hey, now THAT'S poisonous rhetoric. THAT'S a blood libel. That's wrong. And we should put an end such poisonous rhetoric, both from the left and right."