Several unions have placed their support behind Mayor Peter Carlisle in his bid for re-election.

Among those endorsing Carlisle Monday were the Hawaii Carpenters Union, the Hawaii Masons Union and the Hawaii Sheet Metal Workers Union.

Carlisle won a special election for the mayor’s seat in 2010 to fill the remaining two years left in the term of former Mayor Mufi Hannemann, who resigned in order to run for governor.

In this year’s re-election bid, Carlisle faces, among others, former city Managing Director Kirk Caldwell and former Gov. Ben Cayetano. Caldwell has collected a bulk of the endorsements from government worker unions.