US Election 2020 polls Who's in front Trump or Biden
On 3 November, voters in America will determine if Donald Trump will stay in the White House for a further four years.
Democratic Party candidate Joe Biden, who is best known as Barack Obama's vice-president but has been in US politics since the 1970s, is challenging the Republican president.
As election day approaches, by asking voters which candidate they favor, polling companies can try to gauge the nation's mood.
We're going to keep track of the polls here and try and figure out what they can and can't tell us who's going and win the race.
Biden leading national presidential polls
National polls are a good guide as to how popular a candidate is across the country as a whole, but they're not necessarily a good way to predict the result of the election.
In 2016, for example, Hillary Clinton led in the polls and won nearly three million more votes than Donald Trump, but she still lost - that's because the US uses an electoral college system, so winning the most votes doesn't always win you the election.
With that caveat aside, Joe Biden has been ahead of Donald Trump in most national polls since the start of the year. He has hovered around 50% in recent months and has had a 10-point lead on occasions.
By contrast, in 2016 the polls were far less clear and just a couple of percentage points separated Mr Trump and his then-rival Hillary Clinton at several points as election day neared.
A really simple guide to the US election
Which states will decide this election?
As Mrs Clinton discovered in 2016, the number of votes you win is less important than where you win them.
Most states nearly always vote the same way, meaning that in reality there are just a handful of states where both candidates stand a chance of winning. These are the places where the election will be won and lost and are known as battleground states.
