It appears to be commonplace in other countries that voters are marked somehow as having voted. The image the past few days has been of Iraqi voters with their ink-stained fingers. It appears to me as though we should undertake similar measures here in the United States.

Marking a voter isn't a cure-all for solving the voter fraud problem. Someone who votes absentee and then shows up at the polls and casts a ballot there wouldn't be caught with this method. Someone who casts a ballot in two different states would also not be caught using this method.

However, it would stop the kind of voter fraud believed to have occurred in Milwaukee, Wis. Unlike some states, Wisconsin allows same-day registration at polling places. Of course, some form of identification is required -- a driver's license or utility bill will do. But, in an effort to make sure as many people as possible vote, one already registered voter can vouch for any number of others -- no ID required.

At least these illegal voters would only be voting once. It's not perfect, but it would be a good first step.