I always find interesting laws regarding the content of polling, such as Alaska’s:
AS 15.13.095. False Statements in Telephone Polling and Calls to Convince
(a) A candidate who is damaged as the result of a false statement about the candidate made with knowledge that it was false, or with reckless disregard for whether it was false or not, made as part of a telephone poll or an organized series of calls, and made with the intent to convince potential voters concerning the outcome of an election in which the candidate is running may recover damages in an action in superior court under this section against the individual who made the telephone call, the individual’s employer, and the person who contracted for or authorized the poll or calls to convince. However, the employer of the individual or the person who contracted for or authorized the poll or calls to convince is liable to the defamed candidate only if the employer or person authorized the statement to be made, knowing that it was false or with reckless disregard for whether it was false or not, as part of the poll or calls to convince. (b) The court may award damages, including punitive damages. If the court finds that the result of the statement places the integrity of the election process in substantial doubt, the eligibility of the successful candidate to hold the office to which elected shall be determined as provided in AS 15.56.110 (b) or, in the case of a candidate for governor or lieutenant governor, by impeachment under art. II, sec. 20, Constitution of the State of Alaska..
Alaska, I believe, is not alone with laws of this type.