International Union of Operating Engineers Locals 150 and 399

Endorsed 11 candidates in 2026.

Who they are

The International Union of Operating Engineers (IUOE) is a trade union within the United States–based AFL–CIO representing primarily construction workers who work as heavy equipment operators, mechanics, surveyors, and stationary engineers who maintain heating and other systems in buildings and industrial complexes, in the United States and Canada.

From Wikipedia.

Where their endorsements fall

Of the 11 endorsed candidates on our ballots: 11 Democrats.

The 10 with a published academic score (Voteview, Shor–McCarty or DIME) average slightly left. This describes the candidates they endorsed, not International Union of Operating Engineers Locals 150 and 399 themselves.

Who they endorsed

Illinois

Endorsements as listed in the Endorsements sections of Wikipedia's 2026 race articles, each with its own citation there. Those lists cover federal and statewide races well and local races little, so an endorser may have endorsed others not shown here. All endorsers.

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