ID to Vote

A number of our fellow citizens here in the Commonwealth of Massachusetts are pushing a requirement to show an ID to vote.  The United States being a Republic, there are various approaches to this issues, as this web site shows.

I don't see the problem with asking for ID to vote.  I do see a problem with people getting to vote who are not registered to vote for the location where they are voting.  On the other hand, I do see a problem with people who register by mail not getting to vote.  How do we ensure that is not going to happen?  I do like the idea of "provisional ballots".

Regards  —  Cliff