It does generate a new list for each volunteer. I called 30 people and didn't have anyone tell me others had called.
I haven't had anyone tell me that they had been called either.
When I worked the phone bank I got through a few pages of numbers with no problem...lots of support, in fact. Then I picked up another two pages and was told by those I called that they had been swamped with calls and didn't like it!
I received two calls myself. One from the President and one from Laura Bush (both pre-recorded) and I enjoyed getting both of them. But a couple of the people I called said they had 14 calls in one day and were irritated by the inconvenience. As well as we have done, I think we need to do better next time so that the same lists are not called over and over again.