THE VOICE OF REASON?…. How far around the bend are conservatives enraged by Obama’s presidency? They’re so far gone, David Horowitz is urging them to calm down and stop using over-the-top rhetoric.

I have been watching an interesting phenomenon on the right, which is beginning to cause me concern. I am referring to the over-the-top hysteria in response to the first months in office of our new president, which distinctly reminds me of the “Bush is Hitler” crowd on the left. […]

Conservatives, please. Let’s not duplicate the manias of the left as we figure out how to deal with Mr. Obama. He is not exactly the antichrist, although a disturbing number of people on the right are convinced he is. […]

As we move forward, Obama faces increasingly tough choices in the wars against Islamic fascism in Afghanistan, Pakistan, Gaza and Iran. Hopefully, he will make the right choices, and should he do so conservatives will need to be there to support him. If he makes the wrong choices, conservatives will need to be there to oppose him. But neither our support nor our opposition should be based on hysterical responses to policies that we just don’t like.

When David Horowitz is the voice of reason, telling the right to tone down the apocalyptic nonsense, you know conservative leaders have gone a little too far.

As Brendan Nyhan added the other day:

It’s either cause for celebration or a sign of the apocalypse that Horowitz thinks Obama haters have gone too far. This is the man who created a website that purports to link mainstream Democrats to terrorists and anti-American dictators and who published an article written by an employee encouraging censorship of dissent after 9/11. Let’s just say he’s not known for rhetorical restraint.

We’ve reached the point at which Glenn Beck and Sean Hannity make David Horowitz look reasonable by comparison.

I never thought I’d see the day.

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Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.