Ex-Honolulu Mayor Mufi Hannemann is appearing in a TV ad urging a vote for his former rival, Democratic gubernatorial candidate Neil Abercrombie.

In an ad financed by the Hawaii Carpenters Union, Hannemann says Abercrombie will improve the economy, the state’s education system and the environment.

Union spokesman Leonard Hoshijo said Tuesday his organization is asking other groups to contribute toward buying advertising time.

He says the ad began airing Monday — about a week before the Nov. 2 general election between Abercrombie and Republican James “Duke” Aiona.

A recent poll by the Honolulu Star-Advertiser and Hawaii News Now showed Aiona winning a large majority of voters who chose Hannemann in the Sept. 18 Democratic primary.