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No. Removing the block only takes the poll off that page. The poll itself, along with every vote it has collected, stays safely in OpinionCamp.
Think of the block as a window onto the poll rather than the poll itself. Take the window away and visitors can no longer see or vote on the poll, but nothing is deleted. You can still open OpinionCamp > Polls in your WordPress dashboard and view the results at any time.
When you want the poll live again, add a Poll block on any page and choose Select existing. The poll comes back exactly as it was, and new votes are added to the existing totals.