Speaker Emerita Nancy Pelosi will not seek re-election to the US House, bringing to a close her storied career as not only the first woman in the speaker's office but arguably the most powerful in American politics.

Pelosi, who has represented San Francisco for nearly 40 years, announced her decision Thursday.

"I will not be seeking re-election to Congress," Pelosi said in a video address to voters.

Pelosi, appearing upbeat and forward-looking as images of her decades of accomplishments filled the frames, said she would finish out her final year in office. And she left those who sent her to Congress with a call to action to carry on the legacy of agenda-setting both in the US and around the world.

"My message to the city I love is this: San Francisco, know your power,

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