He was interrupted by Bennett, who said "how are you going to be deputy prime minister then? You've got to be up for it, man!"
Davis countered, saying Bennett's electorate was only 20 minutes from her office and she wouldn't understand.
Morgan said he hadn't been in parliament and was yet to make a political mistake. Jones said he "had a PhD in mistakes", getting a laugh from the crowd.
Davidson and Fox both talked about the effect of their jobs on their kids, with Davidson saying she'd once told her daughter off for a Facebook post, worrying how it would look, and she was sorry about that.
The politicians also discussed transport, housing, crime and climate change.
The debate can be viewed on Facebook.
It was the latest in a varied series of debates this campaign.
The next is between Labour leader Jacinda Ardern and Prime Minister Bill English tomorrow.