Act's Epsom candidate, John Banks, and party leader Don Brash are campaigning separately, but Mr Banks denies he is promoting himself at the expense of his party to try to win the Epsom seat.
Asked on Campbell Live what brand he was presenting to Epsom voters, Mr Banks said, "Brand Key", and talked about the popularity of Prime Minister John Key and ensuring National remained in power.
Yesterday, he denied he was downplaying the Act brand to try to win the seat. He said he was trying to persuade Epsom National needed Act not only now, but in future elections.
"I proudly carry the banner for the Act values in Epsom. I make no secret of that. I have the responsibility to keep the dream alive in Epsom."
Polls have shown National's Paul Goldsmith could win Epsom, despite his party indicating it wants only the party vote there.