using CMS.Polls;

...

        string pollName = "testingSitePoll"; // Poll code name

        // Get poll info for the specified code name

        PollInfo pollObj = PollInfoProvider.GetPollInfo(pollName);

        if (pollObj != null)

        {

            // Create a new answer object

            PollAnswerInfo pollAnswerObj = new PollAnswerInfo();

            // Set the fields

            pollAnswerObj.AnswerOrder = PollAnswerInfoProvider.GetLastAnswerOrder(pollObj.PollID) + 1;

            pollAnswerObj.AnswerCount = 0;

            pollAnswerObj.AnswerPollID = pollObj.PollID;

            pollAnswerObj.AnswerEnabled = true;

            pollAnswerObj.AnswerText = "Yes, I love it.";

            // Save the answer

            PollAnswerInfoProvider.SetPollAnswerInfo(pollAnswerObj);

        }