US politics: the southern states that could sway the election

Polling out this week suggests Kamala Harris could be outperforming Donald Trump in the crucial Sun-belt states of Arizona, Nevada, Georgia and North Carolina. So what happens if these polls are right? Can Donald Trump win the presidency without them? This week, Jonathan Freedland speaks to George Chidi, politics and democracy reporter for Guardian US, about how these states could be be make or break for either candidate.