Colorado’s largest teachers union has endorsed Jared Polis, the Democratic candidate for governor.

The endorsement is not a surprise given that teachers unions have traditionally been associated with the Democratic Party. However, the 35,000-member Colorado Education Association had previously endorsed one of Polis’ rivals during the primary, former state Treasurer Cary Kennedy, and contributed money toward negative ads that portrayed Polis as a supporter of vouchers based on a 2003 op-ed, in spite of votes in Congress against voucher programs.

With the primary in the past, CEA President Amie Baca-Oehlert focused on Polis’ support for more school funding, a priority shared by the union.

“Our members share Jared’s concern that too many communities don’t have the resources they need for every child to succeed,” Baca-Oehlert said in the press release announcing the endorsement. “We have created ‘haves and have-nots’ among our children, and nowhere is that more apparent than with our youngest students who don’t receive the same level of quality early childhood education. Jared impressed us with his strong commitment to give all kids a great start and better prepare them for a successful lifetime of learning.”

Polis has made expanding access to preschool and funding full-day kindergarten a key part of his education platform, along with raising pay for teachers.

Polis is running against Republican Walker Stapleton. As state treasurer, Stapleton advocated for changes to the public employee retirement system, including freezes on benefits and cost-of-living raises, that were opposed by the teachers union, something Baca-Oehlert made note of in the endorsement of Polis.

Read more about the two candidates’ education positions here.