It's hard to legally do much about "disinformation" about a political candidate's record or character or about what a ballot measure would mean, because the boundaries of "true" and "false" are murky and because public figures are excluded from most libel and slander protection.
But there are federal statutes criminalizing any attempt to prevent a citizen from excercising his/her franchise rights, and I believe the full force of the law should be applied to investigating, prosecuting, and punishing out and out election fraud (e.g., sending flyers saying the election date has been changed) or voter intimidation (e.g., telling people they will be arrested for trying to vote if they or their relatives have any past police record).
Being convicted of "conspiracy" to commit a felony can carry severe penalties, and I'd really like to see serious investigation of who's behind the widespread election frauds.