Machinists union endorses Clinton
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The International Association of Machinists and Aerospace Workers (IAM) is endorsing Democratic candidate Hillary ClintonHillary Diane Rodham ClintonEx-Clinton aide: Hillary will run again in 2020 Ex-Facebook exec ousted from company sparked controversy with pro-Trump views: report Pelosi says she'll be Speaker ‘to protect the Affordable Care Act’ MORE for president, giving the front-runner her second national union endorsement.

“The IAM will not sit on the sidelines while this fight is so clearly underway,” the group's president, Tom Buffenbarger, said in a statement on Friday.

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“Hillary Clinton has been a strong supporter of this union for years and she is now the target of unprecedented attacks, financed on a scale never seen before. The time to help is when help is needed most, and we intend to do just that," he added.

Union leaders endorsed Clinton after 1,700 members chose her from a field of about 20 candidates by margin greater than 2-to-1. She won the backing of nearly half of the members surveyed.

Seventy-one percent of the union's Democratic members supported Clinton, dwarfing the support for other declared and potential candidates, including Sen. Bernie SandersBernard (Bernie) SandersSchumer’s headaches to multiply in next Congress Sarah Silverman: I'm 'very lucky' I don't have to wear a Jewish star in Trump era US to stop refueling Saudi planes in Yemen MORE (I-Vt.) and Vice President Biden.

The Maryland-based union represents nearly 600,000 workers, according to its website.

In general, union workers have pushed Clinton to voice support for a higher federal minimum wage and to oppose a transpacific trade deal the Obama administration is negotiating.

Clinton received the support of another major union, the American Federation of Teachers, in July. Earlier this week, National Nurses United said it was supporting Sanders over her.