A few National MPs were also there but did not speak.
Myrtle the tractor's owner Bob Appleton declared Ardern a "tax hungry socialist". He had decorated Myrtle with placards including "fart red for Labour" and "Jacinda and the Mob thinks food grows in supermarkets".
One man held up a sign stating "She's a pretty communist" on one side. The other side said "bring back Buck and Winston".
It would have come as a surprise to Winston Peters to discover he'd been away. When he arrived soon after the rally began, few noticed him.
"He's too short," they laughed. "Can't see him."
"I can't control the placards that farmers want to bring," organiser and Federated Farmers Waikato President Andrew McGiven said afterwards.
He had used his speech to say farmers were becoming the punching bags of the election and pleaded for townies to show some understanding of the farmers' role: "New Zealand is too small for a rural-urban divide."
But it was after the official bits were over and the farmers headed off for the march component of the rally - "up the road to the RSA for a beer" - that things got raucous. The self-appointed guardian of the regions leaped on to the stage, grabbing the megaphone. Peters stood there in his pin-striped suit in front of a massive cow udder in the rain and railed on about National's secret plan to charge for water through local government and Treaty settlements.
He asked if Peters would insist Labour took taxes on farmers off the table if he ended up in government with them. Peters responded to that by saying he'd been milking cows before Smyth was born.
Smyth wasn't giving in.
"I'm not against you, mate," he said "but that was a just a bit harsh".
Others shouted "who are you going with? You're going with Labour aren't you? You won't get any votes here."
Peters might have thought only the chardonnay-drinking, pinky finger-pointing media wanted the answers to such questions. Yesterday he discovered the farmers did too.