Hi, all!
I wanted to comment on how we "fixed" this issue. I'm one of Lindsay's colleagues and it required some jerry rigging to figure out what the checkbox as called.
After inspecting the HTML, it looks like the name of the checkbox is called "Nurture Opt-Out". So depending which option you select in the poll, you would add "Nurture Opt-Out" to your Smart List and select either "True" or "False".
I hope this helps for anyone else looking to do something similar. Feel free to reach out to me if you have any other questions.
Thanks!
Jenn