>>Because many of them don't have such an ID (turns out about 10% of PA voters have neither a drivers license nor the state-provided non-drivers photo ID). Getting such an ID can be expensive (both in actual costs and in work hours lost), difficult and time-consuming.
>>
>>And why should a person who has voted at the same polling place for decades, and is known to the poll workers (who are, of course, her neighbors), now need a photo ID?
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>>Tamar
>
>I see. Everyone has an id card in Belgium so that's not a problem.

I think that's true in a lot of countries. The US has no such ID. Individual states offer driver's licenses and at least some offer a photo ID that's not a driver's license. The federal government does offer passports, of course, but they are expensive.

The law that passed here in Pennsylvania allows a few other kinds of ID, but not things that most people would have.

Tamar