This post originally appeared in the Huffington Post.

Earlier this week a Great Falls Tribune reporter found something startling in his inbox: a shockingly racist and misogynistic email forwarded from the most powerful federal judge in Montana, which "joked" that the president of the United States was the product of his mother having sex with a dog. The story soon became national news, with groups like ours calling on Judge Richard Cebull to resign. Cebull quickly apologized to the president and submitted himself to a formal ethics review, somewhat quelling the story. But the story is about more than one judge doing something wildly inappropriate and deeply disturbing. It’s about a conservative movement in which the bile and animosity directed at the president — and even his family — are so poisonous that even someone who should know better easily confuses political criticism and sick personal attack. Come on: going after the president’s late mother? Attempting to explain his email forward, Judge Cebull told the reporter, John S. Adams,

The only reason I can explain it to you is I am not a fan of our president, but this goes beyond not being a fan. I didn’t send it as racist, although that’s what it is. Is sent it out because it’s anti-Obama.

Judge Cebull is hardly alone in using the old "I’m not racist, but…" line. In fact, his email was the result of an entire movement built on "I’m not racist, but…" logic that equates disagreement with and dislike of the president with broad-based, racially charged smears. These smears, tacitly embraced by the GOP establishment, are more than personal shots at the president — they’re attacks on the millions of Americans who make up our growing and changing country. Mainstream conservatives have genuine objections to President Obama’s priorities and policies. But since he started running for president, a parallel movement has sprung up trying to paint Obama as an outsider and an imposter — in unmistakably racially charged terms. Too often, the two movements have intersected. The effort to paint Obama as a threatening foreigner sprung up around the right-wing fringe in the run-up to the 2008 election with the typically muddled conspiracy theory that painted him as both a secret Muslim and a member of an America-hating church. They soon coalesced in the birther movement, which even today is championed by a strong coalition of state legislators and a certain bombastic Arizona sheriff. But the birther movement, the "secret Muslim" meme and the idea that the president of the United States somehow hates his own country are no longer confined to the less visible right-wing fringe. Former House Speaker Newt Gingrich, until recently a frontrunner in the GOP presidential race, continually hammers on the president’s otherness, most notably criticizing his "Kenyan, anti-colonial behavior." Rick Santorum flatly claims that Obama does not have the Christian faith that he professes, and eagerly courted the endorsement of birther leader Sheriff Joe Arpaio. And before they dropped out, Rick Perry and Herman Cain couldn’t resist flirting with birtherism. But perhaps more than either of these fringe-candidates-turned-frontrunners, Mitt Romney has been catering to the strain of conservatism that deliberately confuses policy disagreements with racially-charged personal animosity. Romney went in front of TV cameras to smilingly accept the endorsement of Donald Trump, whose own failed presidential campaign was based on demanding the president’s readily available birth certificate. And Gov. Romney continually attacks Obama — falsely — for going around the world "apologizing for America." Judge Cebull needs to take responsibility for his own actions. And if the GOP has any aspirations of providing real leadership to this country, it needs to jettison the deeply personal vitriol being direct against Barack Obama and start talking about real issues. When a federal judge has seen so much racially-charged propaganda against the president of the United States that he can claim not to know the difference between genuine disagreement and offensive personal smears, something in our discourse has gone terribly awry.