What is one effective strategy used by political campaigns?
they keep all messages about the candidate or issue from getting to the public.
they communicate information to the public about the candidate or issue.
they give funds to various people and organizations.
they stay silent regarding opposing views

One effective strategy used by political campaigns is to communicate information to the public about the candidate or issue.

Explanation: Candidates are expected to bring solutions to a certain community problems so, when they postulate, they have to declare what their propositions to solve the community issues are, as well as their plans to take them to reality. In addition, all information provided on the candidate exalts his or her qualities in order to persuade voters to pick them, regarding they are different from the ones that preceded them and, thus, will make an actual change in the community.

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The answer is: They communicate information to the public about the candidate or issue.

Explanation:

As you may know, before elections, candidates use political campaigns in order to convince the public that they are the best choice, thus, the first option cannot be possible for the main purpose of these political campaigns is to let the audience know that they already know what is the main issue and how they plan to solve it, that's what the audience mostly goes for when choosing who to vote for, they want to listen to arguments and realistic proposals, however, sometimes these only become failed promises. On the other hand, the spend most of their money and time for their political campaigns, so they'll hardly give funds to organizations, even though this could be view by people as positive. And finally, many candidates, on the contrary to the last option, raise theri voice to opposing views as to convince them, that's the idea.