Beto O’Rourke raised an incredible $6.1 million online within just 24 hours of announcing his 2020 presidential bid, it was reported Monday.

The 46-year-old Texas congressman’s contribution levels outpace those of his fellow Democratic presidential contenders, and put him on track to potentially become the party’s nominee.

O’Rourke — who has stressed his campaign’s focus on small donations rather than corporate or political action committee (PAC) money — even surpassed Democratic socialist Sen. Bernie Sanders (I-Vt.), who raised $5.9 million after announcing his own 2020 run last month. Sanders also raised more than $10 million in less than one week of campaigning.

In last year’s midterm elections, O’Rourke came up short but close in a Senate bid against incumbent Sen. Ted Cruz (R-Texas), and his popularity has appeared to only grow stronger ever since. Just days after losing to Cruz, many pundits began speculating whether O’Rourke would launch a 2020 presidential bid.

O’Rourke officially announced his 2020 bid for president on Thursday in a video alongside his wife and also made a visit to Iowa, the site of the caucuses that kick off the presidential primaries. During his appearance in Iowa, the young Democrat issued a message of hope for a great nation that is based on ideas of unity and integrity, and said that he or any of his fellow candidates would be a better leader for the country than President Donald TrumpO’Rourke’s inspiring rhetoric has for some time drawn comparisons to Barack Obama in 2008. Trump commented on O’Rourke’s campaign announcement by saying he was surprised by the Texas congressman’s wild hand gestures, a remark that drew strong mockery for its irony.

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According to several reports, all presidential candidates are required to file fund-raising reports at the end of March. These initial filings will be publicly revealed on April 15, which is Tax Day.

Sen. Kamala Harris (D-Calif.), another 2020 presidential contender, reportedly raised $1.5 million just one day after announcing her bid in January, on Martin Luther King Jr. Day.

O’Rourke’s tweets also showed him traveling to states like Michigan, Ohio and Wisconsin in recent days.