The campaign did not release the number of unique donors to Sanders — many people have given more than once — but aides said that figure is approaching 1 million.
Hillary Clinton, the Democratic front-runner, had raised more money overall than Sanders — $77.5 million to $41.5 million — as of Sept. 30, the last deadline for reporting contributions to the Federal Election Commission. But the Vermont senator had received more donations than any candidate from either party — a trend that appears to be continuing.
With Sanders nearing the 2 million mark, his campaign made a big push this week through email solicitations to cross the threshold.
An online ticker set up Wednesday night kept track of the number of donations as it neared 2 million. The goal was surpassed at 8:11 p.m., according to the ticker.
Aides said that Sanders had raised $1.1 million on Wednesday alone and $2.4 million since announcing his push on Monday.
Sanders has already taken in more individual contributions than Obama did at this point in his 2008 campaign for president. Aides to Sanders said they are confident by the end of the year, Sanders will have more than the 2.2 million donations that Obama did during the equivalent stretch in the 2012 race.
As they approached the 2 million mark, Sanders's campaign cut an ad to commemorate the achievement. Aides said the ad, narrated by Sanders, will run both on television and on the Internet.