Hillary Clinton on Friday won the endorsement of the International Association of Machinists and Aerospace Workers for the 2016 U.S. presidential election, making it the second national union to give the Democratic front-runner the stamp of approval.
The endorsement could give Clinton a significant boost as she seeks to woo labor, even as her main Democratic rival, Senator Bernie Sanders of Vermont, has eroded her edge in opinion polls and has himself landed the endorsement of National Nurses United, the nation's largest organization of nurses.
The union, based in Upper Marlboro, Maryland, represents nearly 600,000 active and retired members, according to its website.
Clinton is trying to win over labor - often a key source of volunteers and funds for Democrats - as part of an effort to build a broad coalition within her party and avoid a potentially damaging, drawn-out primary fight. The winner of the primary contest will face the Republican nominee in the November 2016 election.