At the onset of an electoral contest, a campaign usually checks the public's knowledge of its candidate by means of

Question

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A benchmark survey is conducted at the beginning of a campaign to gauge the public's baseline knowledge and opinions about the candidate and the issues before any significant campaigning has been done. This allows the campaign to tailor their messaging and strategy accordingly. The other options listed are surveys conducted during or after the campaign, and are not specifically designed for this purpose.

At the Onset of an Electoral Contest, a Campaign Usually