Hawaii’s largest union, representing more than 42,000 government workers, endorsed Donna Mercado Kim today for the congressional seat being vacated by U.S. Rep. Colleen Hanabusa.

“Donna has been a fighter throughout her career. Now she’s prepared to take the fight for working people to Washington D.C,” said Randy Perreira, executive director of the Hawaii Government Employees Association, in a press release. “We believe Donna will stand up for middle class Americans and will represent Hawaii well.”

Kim is in a competitive Democratic primary race for the seat representing urban Honolulu. Other contenders include former Congressman Ed Case, Lt. Gov. Doug Chin, state Reps. Beth Fukumoto and Kaniela Ing, Honolulu City Councilman Ernie Martin and Palasi “Sam” Puletasi, a retired immigration agent for the U.S. Department of Justice.