Answer:
There is reason to suspect that the poll is biased.
Explanation:
This poll is being sponsored by the Idaho Potato Commission, and the favorite vegetable was found to be the potato according to the poll. This might be seen as a conflict of interests since it is plausible to believe that the Idaho Potato Commission would have wanted the potato to be selected as the favorite vegetable. Therefore, there is reason to suspect that the poll is biased.