This is a lesson in how dog whistles work.

If you're not familiar with the term "dog whistle," as it relates to politics, here's a quick primer: As a literal dog whistle emits a pitch that only dogs can hear, a political dog whistle sends a message that only a particular constituency will hear (or intuitively understand).

Bush has, care of his speechwriters, been dog whistling to his evangelicals for the past eight years; often, when we heathens think he sounds most nonsensical, it's because he's sending a coded message to his Jesus peeps.

Often, dog whistles are merely a covert shout-out to a particular constituency – but sometimes, they're meant to be provocative, to quietly speak to subconscious (or conscious) biases and evoke a particular visceral reaction.

Such is the case with John McCain's campaign advert conflating Barack Obama's candidacy and person with Paris Hilton and Britney Spears (which can be viewed here). On its face, it's an obvious editorial on Obama's intelligence and competency, as his image is juxtaposed with two women alleged to be airheads while the voiceover intones: "Is he ready to lead?" And naturally there is an element of commentary on whether he is undeserving and entitled, with which Hilton and Spears are routinely charged. Famous for no reason, just a pretty face, the ad implies.

But loitering below the ostensibly substantive critique is something more nefarious. It's no coincidence that it wasn't the vacuous tabloid fixture Spencer Pratt or the "American Idol" punchline Sanjaya Malakar who appear in the advert – and it's not because they're not famous enough. For it was also not Scarlett Johansson chosen for the advert, who famously supports him, has campaigned with him, and whose twin brother works for him, despite her being arguably as recognizable as Hilton and Spears – and it's not because she's not young, blonde, or beautiful enough.

It because neither Pratt, nor Malakar, nor Johansson have personas that are the perfect combination of no brains, no talent, and all slut.

Obama, dog whistles the ad, hitting old racists in the sweet spot, could fuck these white girls – it's practically a Democratic tradition … JFK, Clinton, heck even Carter lusted in his heart – and we don't want that, now, do we?

It recalls the despicable "bimbo ad" used against black senate candidate Harold Ford in Tennessee, in which a white actress was hired to claim she'd met Ford at a Playboy party and asked the candidate to "call me," playing on deeply-ingrained and ancient biases about interracial sex. But the difference between the "bimbo ad" (which was also a Republican production) and the McCain advert is that the former was explicit in its miscegenation message, whereas the latter is more, well, dog-whistly. And its deliberate obliqueness has set in motion a series of events that's all too familiar to feminists, LGBTQI activists, civil rights activists, and various other social justice advocates.

The dog whistle piques them with something the average person won't see as bigoted, but that the constituency for which they advocate (and/or of which they're a part) will expect them to call out, because they instantly spy it and recognize it for what it is; they've heard the tune of that particular string being plucked their whole lives. Then whoever calls it out is marginalized as a hysteric, over-reactionary, looking to get offended, etc.

And that's exactly how the game has played out here. McCain piques Obama and his constituency, Obama responds, McCain and the rightwing accuse Obama of playing the race card, his opponents unleash their new favorite battle cry: "You can't criticize Obama without being called a racist." Clockwork.

See how that works? Wheeeee!

And well-meaning people who miss the low-flying racial message (which will be intuited precisely as designed by old racists) will insist it's just about Obama being ninny-brained and uppity, making the complex deconstruction so easy to dismiss – or, rather, making the people who do the deconstruction easy to dismiss.

Meanwhile, since when did implying a black man is uppity and entitled stop being examined for racist undertones, anyway…?

Woof.