using CMS.Polls;

...

        string pollName = "testingSitePoll";

        // Get poll info for the specified code name

        PollInfo pollObj = PollInfoProvider.GetPollInfo(pollName);

        if (pollObj != null)

        {

            // Get all poll answers

            DataSet answers = PollAnswerInfoProvider.GetAnswers(pollObj.PollID);

            if (!DataHelper.DataSourceIsEmpty(answers))

            {

                // Create pollanswerinfo object from datarow

                PollAnswerInfo pollAnswerObj = new PollAnswerInfo(answers.Tables[0].Rows[0]);

                if (pollAnswerObj != null)

                {

                    // Delete poll answer

                    PollAnswerInfoProvider.DeletePollAnswerInfo(pollAnswerObj);

                }

             }

          }