Hi Olivia,
There's no polling capability within proof. One option you could explore if this was important to you (not a particularly sleek process), would be to create an issue for each participant against the task where your proofs are stored and assign it to them. Each issue could have a custom form attached to it with the poll question(s) that each participant would need to answer. You could then report on this and visualise the results of the poll in a graph.
Not a particularly sleek process, but an option nontheless!
Best Regards,
Rich.