Joe Biden is leading Donald Trump in the national polls for the presidential election, but that doesn’t guarantee the Democratic candidate victory. Hillary Clinton also had a clear lead over Trump in the polls for almost the entire 2016 campaign and ended up losing in the electoral college.
Because the presidential voting system assigns each state a number of electoral college votes, which go to the state’s victor regardless of the margin of victory (with the exception of Nebraska and Maine), a handful of swing states will probably decide the election and be targeted heavily by campaigners.
The Guardian’s Lauren Gambino examines how the race is developing in the areas that could decide the election
