Poll gives Joe Biden 13-point lead on US President Donald Trump

The latest Quinnipiac University poll shows US former vice-president Joe Biden leading President Donald Trump by 13 points nationally in a head-to-head matchup if they were up for election now.

But the poll of 1,214 registered voters, showing Biden winning 53 percent of the vote against 40 percent for Trump, a landslide margin, should be read with caution for several reasons.

"Any poll is a snapshot of the moment," Jonathan Zogby, CEO of research company Zobgy Analytics, told China Daily. "It shows Biden is popular, and the poll will get him media coverage, and that will help build momentum. But we're not sure what voters will do. There are so many variables that could change the race right up to November 2020. This poll doesn't mean Biden will win."