Having failed to change Washington or, as he promised that night in St Paul, Minnesota in June 2008, to provide "good jobs to the jobless" (unemployment was 7.7 per cent when he took office and is 9.6 per cent now), Obama is changing tack.

Boiled down, the new Obama message to Americans is: you're too stupid to overcome your fears. To be fair, it's not entirely new. During the 2008 campaign, Obama was caught on tape at a San Francisco fund-raiser saying it was not surprising that voters facing economic hardship "get bitter, they cling to guns or religion or antipathy to people who aren't like them".

At a fund-raiser in Massachusetts this month, Obama spoke of Democrats having "facts and science and argument" on their side. As opposed, presumably, to the lies, superstition and prejudice that Republicans rely on.

This year, Democrats have embraced with gusto the notion that Republicans, and by extension anyone thinking of voting for them, are dimwits. Their mirth over the likes of Tea Party figures like Christine O'Donnell, the former anti-masturbation activist who once she had "dabbled" in witchcraft and is now a no-hoper Senate candidate in Delaware, seems to know no bounds.

The most chortling of all about the populist Tea Party and its anti-tax, anti-government uprising against the Republican establishment can be found on the shows of Jon Stewart and Stephen Colbert, the edgy liberal satirists on Comedy Central. Mocking Republican candidates last week, Stewart declared the midterm elections as "the best chance ever for a bowl of fresh fruit" to be elected.

Three days before the elections, Stewart will hold a "Rally to Restore Sanity" in Washington on the same day as Colbert, who adopts the character of a Right-wing talk show host, leads a "March to Keep Fear Alive". The thinly-disguised message: Republicans are crazies who trade on fear.

In choosing California and Massachusetts, two of the most liberal states in the union, to demean ordinary Americans during election campaigns, Obama did not display a whole lot of his much-vaunted intelligence. But Obama's decision to plug Stewart's rally approvingly and appear on his show three days beforehand is even more foolish.

In the 1990s, Democrats managed to get away from their image as "eggheads" in the 1950s or "pointy-headed liberals" in the 1970s. Bill Clinton spoke like a Good Ol' Boy from the Deep South, ate junk food and enjoyed trashy women. He was clever, but he did not look down on people.

Obama, by contrast, has become a parody of the Ivy League liberal smugly content with his own intellectual superiority and pitying the poor idiots who disagree with him. It is an approach that shares much with the default anti-Americanism of British and European elites, who love to mock the United States as a country full of gun-toting, bible-clutching morons.

David Cameron has made nods to this sniffy condescension, speaking of the Sarah Palin phenomenon as being "hard for us to understand" (how about giving it a go, Dave?) and describing American conservatism, inaccurately, as moving in a "very culture war direction". This might be part of the reason why he seems to have hit it off with Obama.

The problem for Obama and the Democrats is that belittling the Tea Party movement, which is taking hold of much of Middle America, merely fuels the popular sense that the party in power is out of touch. It also highlights the reluctance of Obama and the Democrats to discuss the Wall Street bail-out, economic stimulus and health care bills because they know they are not vote winners.

Joining the Europeans in mocking ordinary Americans for their supposed idiocy may play well at big-dollar fund-raisers. In adopting this as a political strategy, however, the Democrats could be the ones who end up looking stupid.