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The list includes five Senate races in states that have never elected a woman to the Senate. But in one of those states — Hawaii — Republicans have their own female candidate in former Gov. Linda Lingle. That means the glass ceiling will be broken even if Lingle defeats Rep. Mazie HironoMazie HironoIf our innovators have no reward, how will America compete? Three Dem senators call for 'immediate review' of Kushner's security clearance Poll: Sanders is most popular senator in any home state MORE, the EMILY's List-backed front-runner in the Democratic primary.

Asked by The Hill why the group would pick a fight with Lingle, a centrist Republican woman who has supported abortion rights in the past, Schriock said those factors weren't enough.

"Our mission is to support pro-choice, Democratic women, and it is three of three for a reason," she said.

In another Senate race in Connecticut, the group has backed former Connecticut Secretary of State Susan Bysiewicz (D), putting it at odds with the Democratic Senatorial Campaign Committee, which has thrown its support behind Rep. Chris MurphyChris MurphyDems don’t want to help GOP improve repeal bill Tough road ahead for McConnell on ObamaCare Dem senator: Trump's 'icky' Boy Scout speech left 'my stomach in knots' MORE (D-Conn.).

"Connecticut voters are going to vote for a Democrat against [GOP front-runner] Linda McMahon in November, and EMILY's List is going to do everything we can to make sure that Democrat is Susan Bysiewicz," Schriock said.

The group unveiled a video montage Thursday of big-name Democrats declaring their support for the group, including former President Clinton, Sen. Kirsten GillibrandKirsten GillibrandGOP Senator forces Dems to vote on single payer OPINION | Democrats: Time to wish Hillary Clinton good luck and goodbye Dem says ObamaCare repeal effort moves US ‘toward single-payer’ MORE (N.Y.), Labor Secretary Hilda Solis and Health and Human Services Secretary Kathleen SebeliusKathleen SebeliusOPINION | 5 big ideas to halt America's opioid epidemic Aligning clinical and community resources improves health Sebelius on GOP healthcare plan: 'I'm not sure what the goal is here' MORE.

The PAC also released the results of a poll it commissioned in Oregon on Tuesday, the day Bonamici was elected, showing that female voters list the economy, protecting entitlements and tax fairness as their top three election issues.

Almost 80 percent of those who supported Bonamici said her Republican rival's opposition to abortion rights was a factor in their decision.

— This story was updated at 3:06 p.m.