Bernie Sanders raises $6 million in first 24 hours of presidential campaign

The senator from Vermont announced his campaign on Tuesday.

Sanders' team announced before noon on Wednesday -- about 24 hours into his official campaign -- that over 225,000 people had donated a combined $6 million. The candidate's team also touted that the average donation was $27.

After 12 hours, Sanders's campaign reported the senator had raised about $4 million.

He put the full-court press on for donors throughout the first day of his campaign. He tweeted eight times asking for donations -- seven times in English and once in Spanish -- on Tuesday.

The senator blew past the early donation totals from the other candidates already involved in the 2020 race. California Sen. Kamala Harris, who announced her candidacy on "Good Morning America" on Jan. 21, raised $1.5 million on her first day -- a total her staff happily touted showed "numbers [that] reveal a campaign powered by the people."

Other blockbuster names who could enter the race include former Vice President Joe Biden and billionaire ex-New York City Mayor Mike Bloomberg.

Sanders, I-Vt., earned a reputation as a populist candidate running a similar campaign in 2016 to what he is likely to run this time. He touted "Medicare-for-all," free college education and a $15 minimum wage both three years ago and Tuesday in announcing his second presidential run. He readily identifies as a Democratic socialist in an era when political candidates like Reps. Alexandria Ocasio-Cortez, D-N.Y., and Rashida Tlaib, D-Mich., have been elected on the same platform.

Hillary Clinton beat out the 77-year-old for the Democratic nomination in 2016 before she eventually lost to Trump. At 79, he would be the oldest president ever elected in November 2020.

Trump had kind words for Sanders at at announcement about the Space Force on Tuesday, saying, "I think he was taken advantage of. He ran great four years ago and he was not treated with respect by Clinton."

Sanders is dealing with different circumstances than 2016. He has been criticized over his 2016 campaign's handling of sexual harassment claims made by women against senior members of his staff.

He apologized for "inadequate" standards and 2016 campaign manager Jeff Weaver told ABC News on Tuesday that the candidate would "forcefully" address the issue in his new campaign.

Sanders served as a congressman from 1991 to 2006 and then as senator the past 13 years.

ABC News' Johnny Verhovek contributed to this report.

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