It is polling day in the US, so Jonathan Freedland is chatting to the humour writer Alexandra Petri of the Atlantic to run through this election cycle’s most effective ad campaigns, surprising alliances and embarrassing gaffes

There are 435 seats in the House of Representatives, 35 in the Senate and 39 governorships up for grabs in Tuesday’s midterm elections. Jonathan Freedland is joined by Carrie Dann, of the Cook Political Report, to run through some of the races to watch before the final weekend of campaigning