I see that on the presidential election news these days that "Trump holds double-digit lead in 2 national polls", I don't understand what it means.
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The convention in the reporting of opinion polls is that the results are given as percentages. If a candidate is reported as having a "2-point lead", it means x+2 percent of the electorate intend to vote for that candidate, as opposed to x percent intending to vote for the leading rival.
A "double-digit lead" means the difference in percentages is in double-digits, i.e. greater than 10%.