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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 Keiko HironoDem senator: Trump 'made clear' that he wants 'white people to come to our country' Hawaii false alarm sparks panic, confusion Dem senator working to ensure Hawaii false alarm ‘never happens again’ 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 MurphyChristopher (Chris) Scott MurphyFlake's anti-Trump speech will make a lot of noise, but not much sense Senate campaign fundraising reports roll in Puerto Rico's children need recovery funds 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 Elizabeth GillibrandTrump thinks he could easily beat Sanders in 2020 match-up: report Listen: EMILY’s List upbeat about Dem House in '19 Desperate Democrats shouldn't settle for Oprah MORE (N.Y.), Labor Secretary Hilda Solis and Health and Human Services Secretary Kathleen SebeliusKathleen SebeliusThe House needs to help patients from being victimized by antiquated technology Obama cabinet official: Clinton White House doubled down on 'abusive behavior' John Roberts has tough job of keeping faith in Supreme Court 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.