USA -Joe Biden is leading Donald Trump in the national polls for the presidential election.
But that does not guarantee the Democratic candidate victory. Hillary Clinton also had a clear lead over Trump in the polls for almost the entire 2016 campaign, she ended up losing in the electoral college.
The presidential voting system assigns each state a number of electoral college votes that go to the state’s victor regardless of the margin of victory. A handful swing states will probably decide the election and be targeted heavily by campaigners.
There could be over-counting of Democratic support at play, as more people may say they will vote for Biden than actually turn out.
The latest polling average has put Biden ahead of Trump nationally. While the national poll tracker is a poor indicator of how crucial swing states will sway the election, a strong polling lead across the country can point to how the race will develop.
Americans will vote for their next president, with a choice between Donald Trump and his Democratic challenger Joe Biden, on 3 November.
