Who are the wisest prophets?

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"The Lord your God will raise up for you a prophet like me from among your own people; you shall heed such a prophet." In an election year, this passage from Deuteronomy makes me feel slightly sick to my stomach.

Most of us have run across someone whom we are fairly sure is a "prophet who speaks in the name of other gods," but in election years we hear so many voices, all of them clamoring to be more prophetic than the next. How are we to choose the truly prophetic voice? How are we to know who is best suited to receive such power and authority?