Democratic presidential nominee Joe Biden has cemented his national lead over President Donald Trump a month ahead of Election Day with a 16-point lead.

A CNN poll published Tuesday of likely voters showed 57% preferring Biden to Trump’s 41%. The previous version of the poll, conducted in late August among registered voters, showed Biden with an 8-point lead, ahead of Trump 51-43%.

The latest poll surveyed likely voters Thursday through Sunday, after the first presidential debate and largely after Trump’s announcement on Friday that he had contracted COVID-19.

While Biden has opened a large national lead, electoral analysts encourage people to give more weight to swing-state polls — in order to avoid a repeat of 2016, where former Democratic nominee Hillary Clinton polled better nationally, won the popular vote and lost the election.

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A RealClearPolitics average of polling in top battleground states shows Biden up in every state, but by a much slimmer margin (4.6 points on average), ranging from a 1.4-point lead in North Carolina to 7.1 points in Pennsylvania.

The national CNN poll, conducted by SSRS, surveyed 1,001 likely voters from Oct.1-4 and has a margin of error of +/-3.6%.

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