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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 HironoSenators discuss 'me too' campaign on sexual harassment Dem senator: Trump's feuding with McCain shows how 'egocentric' he is Dem rep: Trump's DACA demands 'lack basic humanity' 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 MurphyDems mull big changes after Brazile bombshell After Texas shooting, lawmakers question whether military has systemic reporting problem Warren to GOP: Thoughts and prayers not enough after Texas shooting 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 GillibrandAfter Texas shooting, lawmakers question whether military has systemic reporting problem Senators push mandatory sexual harassment training for members, staff CNN to air sexual harassment Town Hall featuring Gretchen Carlson, Anita Hill MORE (N.Y.), Labor Secretary Hilda Solis and Health and Human Services Secretary Kathleen SebeliusKathleen SebeliusJohn Roberts has tough job of keeping faith in Supreme Court Price was a disaster for HHS — Time for an administrator, not an ideologue Trump says he's unhappy with Price 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.