WASHINGTON — Nancy Pelosi, the California Democrat who scaled the leadership ladder to become the first female speaker of the House, will not seek a 21st term next year, she announced in a video message Thursday.

“I want you, my fellow San Franciscans, to be the first to know: I will not be seeking reelection to Congress. With a grateful heart, I look forward to my final year of service as your proud representative,” Pelosi said in the video.

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