PRINCETON, New Jersey — As an Australian citizen, I voted in the recent federal election there. So did about 95 percent of registered Australian voters. That figure contrasts markedly with elections in the United States, where the turnout in the 2004 presidential election barely exceeded 60 percent. In congressional elections that fall in the middle of a president's term, usually fewer than 40 percent of eligible Americans bother to vote.

There is a reason why so many Australians vote. In the 1920s, when voter turnout fell below 60 percent, Parliament made voting compulsory. Since then, despite governments of varying political complexions, there has been no serious attempt to repeal the law, which polls show is supported by about 70 percent of the population.

Australians who don't vote receive a letter asking why. Those without an acceptable excuse, like illness or travel abroad, must pay a small fine, but the number fined is less than 1 percent of eligible voters.