We did not catch it at the time, but The Fix, the Washington Post's politics blog, added Hawaii to the list of the top 15 governor's races after former Honolulu Mayor Mufi Hannemann announced his independent campaign.
From the blog:
15. Hawaii (Democratic-controlled): Massachusetts comes off of our top 15 after two polls showed state Attorney General Martha Coakley (D) up double-digits in the general election and – perhaps as importantly for Democrats – one of them showed her ahead by 31 points in the Democratic primary. On comes Hawaii, where former Honolulu mayor Mufi Hannemann announced Thursday that he is running as an Independent Party candidate. This could complicate matters for already-unpopular Gov. Neil Abercrombie (D), who defeated Hannemann in the 2010 Democratic primary. Former lieutenant governor Duke Aiona (R) also running. He was defeated by Abercrombie in 2010. (Previous ranking: N/A)