SOMEWHERE in NORTHERN IOWA — The unthinkable has happened. Senator John McCain met a question, while sitting with reporters on his bus as it rumbled through Iowa today, that he couldn’t – or perhaps wouldn’t – answer.

Did he support the distribution of taxpayer-subsidized condoms in Africa to fight the transmission of H.I.V.?

What followed was a long series of awkward pauses, glances up to the ceiling and the image of one of Mr. McCain’s aides, standing off to the back, urgently motioning his press secretary to come to Mr. McCain’s side.

The upshot was that Mr. McCain said he did not know this subject well, did not know his position on it, and relied on the advice of Senator Tom Coburn, a physician and Republican from Oklahoma.

TO TURN over the supposed Anglo-American common ground carefully, The Economist commissioned pollsters at YouGov in Britain and Polimetrix in America—supported by additional funds from the Hoover Institution, a California think-tank—to find out what people in both places thought about a number of social, political and economic matters. A thousand people in each country were consulted between March 7th and 11th. Broadly, the differences between the two countries look more striking than the similarities.

Like most west Europeans, Britons tend to have more left-wing views than Americans, but the first chart shows that this is often by a surprising margin. (“Left” and “right” are harder to locate than they were: here “left” implies a big-state, secular, socially liberal, internationalist and green outlook; right, the reverse.) The data are derived by subtracting left-wing answers from right-wing ones, for each country and for each main political grouping within each country. A net minus rating suggests predominantly left-wing views and a positive rating suggests a preponderance of right-wing views.

The gap between Britain and America is widest on religion: even British Conservatives are a great deal more secular than American Democrats are. The two are a bit closer on social values (abortion, homosexuality and so forth), and they overlap on ideology (mainly, how active the state should be), with Britain’s Tories to the right of America’s Democrats.

They chase the misplaced apostrophe, the disagreeing subject and verb.

The horror (as opposed to "horor") of a courthouse sign, engraved and erected at taxpayer expense, omitting the first "o" in "meteorological." The "desserts" unjustly advertised as "deserts" on a restaurant wall.

They seek, in short, to do for America's public signage what spell-check software has done for interoffice e-mail: smarten it up and make it easier on the eye. Their weapons: Wite-Out, markers, ink pens, tape, and nerves of steel.