BOSTON (CBS) – A group featuring a young Massachusetts girl has selected the historically significant woman they hope will replace Andrew Jackson on the $20 bill.

“Women on 20s,” an organization that is proposing President Obama replace Jackson’s face on the $20 bill with a woman, announced on Tuesday that Harriet Tubman is the female figure they ask be added to the bill.

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The group conducted polling for 10 weeks on its website before announcing its proposal to the White House.

Sofia, a fourth-grade student from Massachusetts, wrote a letter to Obama earlier this year requesting a woman be added to U.S. currency.

Sofia wrote the president, hoping to get more women on U.S. currency. (Image Credit: Women On 20s)

Sofia wrote the president, hoping to get more women on U.S. currency. (Image Credit: Women On 20s)

Obama responded to Sofia, saying her determination was impressive. The president invited Sofia to a White House Easter event.

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Women on 20s adopted Sofia as a junior ambassador as a result of her efforts.

The organization invited supporters to join a “virtual march” to the White House by using the hashtag #DearMrPresident on social media to bring attention to the cause.

“Think of it as a chant for women’s equality & value that will ring across the internet in tweets and Facebook messages heard loud and clear in Washington,” Women on 20s wrote.

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For more information on the Women on 20s campaign, visit the organization’s website.