The most recent CNN poll shows Democratic candidate Joe Biden getting 53% voting preference, compared to 43% for President Donald Trump in Pennsylvania.
In Florida, another key state, Biden has a voting intention of 50%, compared to 46% for Trump, which is interpreted as a technical tie.
In both cases the margin of error is +/- 4%.
We show you the 2016 polls in those two states, when Hillary Clinton was the Democratic candidate.