Sen. Bernie Sanders (I-Vt.) raised $25.3 million during the past three months for his White House bid, his campaign said Tuesday, fueled by an army of low-dollar donors to post the largest quarterly haul so far this year among the Democratic presidential contenders.

Sanders transferred an additional $2.6 million from his other federal campaign accounts, the campaign said.

The third-quarter figures announced by the campaign rival his $26 million haul at this point in the primary campaign in 2015, when he stunned the Democratic field by nearly matching the total of his opponent, Hillary Clinton, with an infusion of money from donors giving less than $200. Yet this time, he is facing more than a dozen opponents.

One of them, South Bend, Ind., Mayor Pete Buttigieg, announced early Tuesday that his campaign raised more than $19.1 million in the third quarter — less than Sanders did but an amount that gives him staying power in a crowded field.