Six of the seven women running in Colorado's Democratic Senate primary are asking the Democratic Senatorial Campaign Committee (DSCC) to rescind its endorsement of former Gov. John Hickenlooper John HickenlooperThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Cook Political Report shifts Colorado Senate race toward Democrat Willie Nelson playing at virtual fundraiser for Hickenlooper MORE (D).

Their letter to the DSCC, obtained by a Denver ABC affiliate, was sent Monday, on U.S. Women's Equality Day, and lamented that qualified women are often "passed over" in favor of male candidates.

“We are writing today to urge the Democratic Senatorial Campaign Committee to reconsider its early endorsement of former Governor John Hickenlooper," wrote Alice Madden, Diana Bray, Stephany Rose Spaulding, Lorena Garcia, Michelle Ferrigno Warren and state Sen. Angela Williams.

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"All of us, like many women in Colorado and across the country, have seen well-qualified women passed over for male candidates in the workplace time and again," they added in the letter to the DSCC, Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) and Sen. Catherine Cortez Masto Catherine Marie Cortez MastoHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Senators introduce bipartisan bill to mandate digital apps disclose country of origin Democratic Senate campaign arm raised nearly M in August MORE (D-Nev.), the chairwoman of the DSCC.

They also raised questions about Hickenlooper's comments regarding progressive Democrats.

"Governor Hickenlooper is utterly disrespectful and tone deaf to the contributions of activists and communities that make Colorado a leader on progressive values," they wrote.

DSCC spokesperson Lauren Passalacqua told The Hill in a statement Tuesday that the DSCC would support Hickenlooper, saying he was the party's best chance to defeat Republican incumbent Sen. Cory Gardner Cory Scott GardnerBreaking the Chinese space addiction Trump dumbfounds GOP with latest unforced error Billionaire who donated to Trump in 2016 donates to Biden MORE (Colo.).

"John Hickenlooper is far and away the strongest candidate to beat Cory Gardner, and we’re proud to support him in his run for Senate,” Passalacqua said.

Hickenlooper's campaign told The Hill in a statement on Tuesday that the candidate will work hard to earn votes despite strong challengers.

"This is a talented field of candidates, who will all have the opportunity to make their case and voters will make this decision," said campaign spokeswoman Jacque Montgomery. "John will be working hard to earn the vote of every Coloradan.”

Hickenlooper announced last week that he enter Colorado's crowded Democratic Senate primary after he dropped out of the 2020 Democratic presidential primary.

The DSCC tweeted support for him following his announcement.

"With all the options in the crowded Colorado primary, it’s shocking Chuck Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE and Washington Democrats decided to ignore the female candidates in this race and back Hickenlooper – someone who has exhibited blatant disrespect toward women," National Republican Senatorial Committee spokesperson Joanna Rodriguez said in a statement on Tuesday. "Hickenlooper will have to continue to answer for his tone-deaf comments about women, and by endorsing him, the DSCC will too."

--This report was updated on Aug. 28 at 11:21 a.m.