Paul Krugman says this much more eloquently than I can:
There was what President Obama likes to call a teachable moment last week, when the International Olympic Committee rejected Chicago’s bid to be host of the 2016 Summer Games. …
So what did we learn from this moment? For one thing, we learned that the modern conservative movement, which dominates the modern Republican Party, has the emotional maturity of a bratty 13-year-old.
But more important, the episode illustrated an essential truth about the state of American politics: at this point, the guiding principle of one of our nation’s two great political parties is spite pure and simple. If Republicans think something might be good for the president, they’re against it — whether or not it’s good for America.
To be sure, while celebrating America’s rebuff by the Olympic Committee was puerile, it didn’t do any real harm. But the same principle of spite has determined Republican positions on more serious matters, with potentially serious consequences — in particular, in the debate over health care reform.