(CNN) Democratic freshman Rep. Alexandria Ocasio-Cortez of New York announced on Friday that her political action committee will endorse a series of progressive women congressional candidates, including challengers to incumbent Democrats.

Ocasio-Cortez said on Twitter that the group, Courage to Change, is endorsing seven women candidates. Six of them are running for House seats and one is running for a Senate seat.

Cristina Tzintzún Ramirez, one of the candidates to get an endorsement, is running in the Democratic primary in the race to challenge Republican Sen. John Cornyn of Texas. She will be competing in a crowded field of Democratic candidates, including MJ Hegar, who has been endorsed by the Democratic Senatorial Campaign Committee , the campaign arm for Senate Democrats.

Two of the candidates are mounting primary challenges to incumbent House Democrats and have been previously endorsed by Ocasio-Cortez: Marie Newman, a Democrat challenging Democratic Rep. Dan Lipinski in Illinois and Jessica Cisneros, a Democrat challenging Democratic Rep. Henry Cueller in Texas.

One of the candidates, Kara Eastman in Nebraska, is running in the Democratic primary to challenge Republican Rep. Don Bacon.

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