(CNN) Pete Buttigieg had the single biggest fundraising day of his 2020 campaign on Monday, according to an aide to the South Bend, Indiana, mayor, receiving a significant boost after a widely heralded performance during a CNN town hall.

A series of top Democrats from across the party's political spectrum touted Buttigieg's hour on the CNN stage over the last 24 hours, arguing that the little-known mayor deserves a shot at the presidency because of what he displayed during the event moderated by CNN's Jake Tapper.

According to the Buttigieg aide, the mayor raised more than $600,000 from over 22,200 donations in the 24 hours after the CNN town hall. The number is even more significant, the aide said, because the committee employs 20 staffers, lean when compared to other Democratic operations.

"I'm thrilled by the support we've received over the last day," Buttigieg said in a statement. "We're not accepting corporate PAC money and we don't have the gilded fundraising base that comes with being a more established figure in Washington, so grassroots fundraising will be crucial for this effort."

He added: "It's clear there's a real appetite for a new kind of messenger in our party, and I am working hard to seek new audiences and further expand our growing base."

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