I support ID at the polls. It seems like on busy days fraud could rear it's ugly head.
In the four times I have worked, we have had 30-70% turnout. We're told no ID required. We've had no problem. People come in and say their names. The system is that if there is a duplicate we would have a problem, because the previous person could be the fraud. So ID could prevent that, even though I haven't seen it.
If the person is not on the list, we can let them vote provisional and we do check ID because the registrar has to confirm the vote in the next 2-3 days. We have 6-20 of those on a given day. Some are registered at other polls and they just came into the wrong place.
The issue about constitutionality is a ridiculous one. How could we have a system where we let you vote and don't know if you were supposed to. That position is ridiculous and the court did the right thing, no matter how many problems there are.
I’ve been a CA pollworker several times also. Two problems as I see it. Other States might not have our fairly good system; each one sets it’s own rults. The fraud potential is not at the polls but in getting on the voting register in the first place; registering for voting is much too easy for a non-citizen or for someone wanting to multiple-register.