A suggested solution is to make a general statement rather than one referring specifically to the opponent. Also avoid the popular fallacy that correlation proves causation. People who own Cadillacs, on average, have higher incomes than people who don't. This does not mean that if we provided people with Cadillacs that they would have higher incomes. If you want to see some excellent examples of innuendo, watch Rush Limbaugh.
Politicians are, unfortunately, frequently guilty of using innuendo.
It is an easy way to capitalize on popular prejudices without having to make explicit statements which might be difficult or impossible to defend against rational attack. Be sure of your facts. Where crucial facts are concerned, it is best to check with more than one source. Often international publications will give you a different perspective than your hometown newspaper. Check to see whether the book you are using was published by a regular publishing company or whether it was published by some special interest group like the John Birch Society or a religious organization.