With just four days until polling day, join our US correspondents on the road as they examine the closing arguments from each campaign.     James Matthews takes listeners inside Donald Trump’s Maddison Square Graden rally and finds out if controversial jokes by a support act could jeopardise his chances with Hispanic voters - a key demographic in vital swing states.     And Martha Kelner heads to Kamala Harris’s rally on the Ellipse, in Washington DC - the same spot President Trump rallied before supporters stormed the Capitol on 6 January - to see if her message of unity is landing with young voters.    Producer: Rosie Gillott Editor: Paul Stanworth