Getty Images
Now playing
01:01
Hillary Clinton taunts Donald Trump
CBS
Now playing
01:43
Hillary Clinton defends Bill not resigning
CNN
Now playing
02:12
Clinton: Kavanaugh ceremony a political rally
Now playing
01:48
Clinton laughs at Kavanaugh's comment
CBS
Now playing
01:00
Hillary Clinton makes cameo on 'Murphy Brown'
hillary clinton amanpour impeachment_00014522.jpg
hillary clinton amanpour impeachment_00014522.jpg
Now playing
01:47
Clinton: Impeachment 'will be left to others to decide'
hillary clinton republicans amanpour intv vpx_00000000.jpg
hillary clinton republicans amanpour intv vpx_00000000.jpg
Now playing
03:04
Clinton: Civility starts by electing Democrats
Now playing
00:55
Clinton ends Franklin tribute with smartphone
CNN
Now playing
01:49
Clinton rejects Trump comparisons to her husband
Schomburg Center
Now playing
01:58
Bill Clinton: I apologized for Lewinsky scandal
US President Donald Trump (L) and Russian President Vladimir Putin arrive for a meeting in Helsinki, on July 16, 2018. (Photo by Brendan Smialowski / AFP)        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
BRENDAN SMIALOWSKI/AFP/Getty Images
US President Donald Trump (L) and Russian President Vladimir Putin arrive for a meeting in Helsinki, on July 16, 2018. (Photo by Brendan Smialowski / AFP) (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Now playing
04:21
Fact check: Hillary Clinton's misleading comments
Former US Secretary of State Hillary Clinton speaks at the Eighth Annual Women in the World Summit at Lincoln Center for the Performing Arts on April 6, 2017, in New York City.
Angela Weiss/AFP/Getty Images
Former US Secretary of State Hillary Clinton speaks at the Eighth Annual Women in the World Summit at Lincoln Center for the Performing Arts on April 6, 2017, in New York City.
Now playing
00:39
Hillary Clinton goes after al-Assad, Putin
AUSTIN, TX - NOVEMBER 17:  Former U.S. Secretary of State Hillary Rodham Clinton signs copies of her new book 'What Happened' at BookPeople on November 17, 2017 in Austin, Texas.  (Photo by Rick Kern/WireImage)
Rick Kern/WireImage/WireImage
AUSTIN, TX - NOVEMBER 17: Former U.S. Secretary of State Hillary Rodham Clinton signs copies of her new book 'What Happened' at BookPeople on November 17, 2017 in Austin, Texas. (Photo by Rick Kern/WireImage)
Now playing
01:29
Clinton: Trump parrots what Putin says
TV3
Now playing
01:01
Clinton: Children treated as political pawns
Broadway Video/Universal Television
Now playing
01:15
Miley Cyrus tears up thanking Hillary Clinton
RBG on sexism and HRC_00010727.jpg
RBG on sexism and HRC_00010727.jpg
Now playing
01:50
RBG says Clinton was criticized worse than men
(CNN) —  

AFSCME, the largest trade union of public employees in the United States, endorsed Hillary Clinton for president Friday, according a release from the group provided to CNN.

The endorsement, a key for Clinton, came after the 35 person member-elected board representing American Federation of State, County and Municipal Employees councils and affiliates from around the country voted to back the former secretary of state.

“The next president will make decisions that could make or break the ability of working people across America to sustain their families. That’s why we spent the last six months engaged in the most member-focused, in-depth, and transparent endorsement process AFSCME has ever undertaken,” said AFSCME President Lee Saunders

Saunders added the group was looking for someone to fix the “out-of-balance economy.”

“Members want a candidate who will make it easier instead of harder to join together in strong unions and stand together for wages and benefits that can sustain our families,” he said. “What we also heard was AFSCME members want the candidate who will be the most effective champion for working families, and who will be able to deliver a victory in this critically important election. AFSCME members believe that candidate is Hillary Clinton.”

The decision came after the union had conversations with all candidates, including Clinton, former Maryland Gov. Martin O’Malley and independent Vermont Sen. Bernie Sanders. All three candidates participated in town hall meetings with the unions in Iowa earlier this year and the union used three member polls to gauge which candidates their members we backing.

Polling, according to Saunders, showed that nearly two thirds of AFSCME members would vote for Clinton in the Democratic primary.

The AFSCME endorsement is big for Clinton, who is coming off arguably the best three weeks of her campaign. With the endorsement, the 1.6 million members of the union will provide help on the ground in key states and will be able to back her campaign financially, too.

The national endorsement does not mean that AFSCME state chapters are compelled to endorse Clinton, but the national endorsement is the only backing that comes with organization and money, according to union spokespeople.

The Sanders campaign brushed off the endorsement.

“Bernie is proud to have the grassroots support of tens of thousands of working families in AFSCME and other unions,” Sanders’ spokesman Michael Briggs said.

Republicans were quick to use the endorsement against Clinton.

“Hillary Clinton is now officially beholden to the big government union bosses who routinely put their special interests ahead of the hard working taxpayers,” RNC Chairman Reince Priebus said in a statement. “With their endorsement, its clear AFSCME is counting on Hillary Clinton to block commonsense efforts to reign in Washington’s runaway wasteful spending that is mortgaging our children’s future.”

The union has long been supportive of the Clintons. AFSCME backed Clinton in 2007 and went early for then-Gov. Bill Clinton in 1992.

The union is a major player in Iowa, too, representing 40,000 public employees.