For GOP presidential candidates, winning the right to participate in the first debate on Fox News next month means they'll have to be ranked as one of the top 10 contenders, but that ranking may well depend on which polls are used.

A Fox press release from May says the leading 10 candidates, based on an average of the five most recent national polls, will be able to debate. The polls "must be conducted by major, nationally recognized organizations that use standard methodological techniques," Fox said.

But there are more than five national polls, and Fox hasn't said which polls will be used. That means the 10 candidates who make it to the stage will depend on which five polls Fox uses, and how those polls treat the candidates.

Different polls sample different people, and that can produce different results that either benefit or work against a candidate's odds to secure a coveted spot on the stage.

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