In the battleground state of Arizona polls give Donald Trump the slimmest of leads.
The race is so tight that both candidates visited Phoenix on Halloween, in a final push for votes.
Kamala Harris needs to win over moderate Republicans if she wants to seize the momentum, including suburban women who she’s been busy courting during this campaign.
So are they likely to shift her way? Our Washington Correspondent Siobhan Kennedy has been in Arizona, to find out.