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.
I hadn’t thought of that part of it. If the registration was tight and the ID shown at the poll, that would set up a good two-point check.