Unsurprisingly, the opposition group has support from those directly affected by a rail line:
http://www.honolulutraffic.com/whoweare.htm
Some of them look like small businesses (probably some of which happen to be owned by the individuals against rail):
Andy's Pool Service Corp.
Charley's Taxi & Tours
E.N. Kemp & Associates, Inc.
Elite Limousine
Grassroot Institute
Hawaii Activities andTours
Association (HAATA)
Hawaii Transportation Association
HonCab
Kahala Kai Taxi
Maui Divers of Hawaii, Ltd.
Moana Taxi
Pacific Business Appraisers, LLC
Pacific Business Valuation, LLC
Paradise Cruise, Ltd.
Pegge Hopper Gallery
Polynesian Hospitality
RobertsHawaii
Robert's Taxi
Small BusinessHawaii (SBH)
Star Taxi
Superstar Hawaii Transit
Talk Story Magazine, Inc.
The Cab
Waikiki Residents Association
Waikiki Taxi
I've bolded all the obvious ones. 11/26 of businesses that support opposition are limo/cab companies. Obviously, these businesses feel that rail rapid transit will siphon traffic away from their core business, otherwise why would they oppose it. Which really calls into question the argument that visitors don't ride transit. (Anyone who has been on a bus and heard the Japanese announcements knows that's not true!) The problem is... they KNOW it will be a success.