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Where did you edit the template? If you did it in template_c nothing will happen. You have to go to: admin->systemmenu->templates, system->xoopspolls->xoopspoll_index.html.
Here you can make changes. I would advise you to change the table classes to (example) class=poll and add them to your theme CSS. Then you can make all adjustments easy nd quickly. note: you must have a template other then the default, because it's not allowed to edit the default.
Hope this helps.