So the reign of George W. Bush, the first true Southern Republican president since Reconstruction, was the culmination of a long process. And despite the claims of some on the right that Mr. Bush betrayed conservatism, the truth is that he faithfully carried out both his party’s divisive tactics  long before Sarah Palin, Mr. Bush declared that he visited his ranch to “stay in touch with real Americans”  and its governing philosophy.

That’s why the soon-to-be-gone administration’s failure is bigger than Mr. Bush himself: it represents the end of the line for a political strategy that dominated the scene for more than a generation.

The reality of this strategy’s collapse has not, I believe, fully sunk in with some observers. Thus, some commentators warning President-elect Barack Obama against bold action have held up Bill Clinton’s political failures in his first two years as a cautionary tale.

But America in 1993 was a very different country  not just a country that had yet to see what happens when conservatives control all three branches of government, but also a country in which Democratic control of Congress depended on the votes of Southern conservatives. Today, Republicans have taken away almost all those Southern votes  and lost the rest of the country. It was a grand ride for a while, but in the end the Southern strategy led the G.O.P. into a cul-de-sac.

Mr. Obama therefore has room to be bold. If Republicans try a 1993-style strategy of attacking him for promoting big government, they’ll learn two things: not only has the financial crisis discredited their economic theories, the racial subtext of anti-government rhetoric doesn’t play the way it used to.

Will the Republicans eventually stage a comeback? Yes, of course. But barring some huge missteps by Mr. Obama, that will not happen until they stop whining and look at what really went wrong. And when they do, they will discover that they need to get in touch with the real “real America,” a country that is more diverse, more tolerant, and more demanding of effective government than is dreamt of in their political philosophy.