(CNN) South Bend, Indiana, Mayor Pete Buttigieg has made one of his biggest hires to date. Jess O'Connell, former Democratic National Committee CEO, is now a senior adviser to his presidential campaign.

The veteran democratic operative confirmed her new role with the campaign in a series of tweets Thursday: "I agree with Pete — this isn't about winning an election, this is about winning an era ... I am especially proud of the women running for president. I support Pete, but I am rooting for us all."

The hire comes after Buttigieg, once a little known mayor from Indiana, raised nearly $25 million in the second quarter, the most of any 2020 democratic presidential candidate, and has ramped up his staffing to look like a top-funded campaign.

O'Connell, who was also the executive director of Emily's List and had a senior role in Hillary Clinton's 2008 presidential campaign, will lead the Buttigieg campaign's early state strategy and advise the campaign on political and electoral strategy.

Buttigieg also added another senior staffer this week, Sonal Shah, as national policy director, Chris Meagher, the campaing's press secretary, confirmed to CNN.

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