Even more disheartening for her Republican rivals: Her fund-raising tally — and the gulf with her opponents — could easily grow larger.

Warren’s campaign says the $3.12 million amassed during the year’s first quarter gives her an eye-popping total of $15 million cash in the bank more than six months before Election Day.

Massachusetts Senator Elizabeth Warren, the most prolific fund-raiser in the US Senate, raised more than a million dollars a month in the first three months of the year, and more than 10 times what each of her Republican opponents raised during the same period, according to her campaign.


Nearly all of her contributions were $100 or less, according to the campaign. That’s a key measure, as it means that, in theory, the same group of people who collectively gave her millions in the first three months of the year could continue donating without concern about hitting their individual federal maximum contribution of $2,700.

It is unclear what percentage of Warren’s contributions came from Massachusetts residents, but the campaign estimated that there were over 10,000 individual contributions from in-state.

Warren’s three main Republican challengers — state Representative Geoff Diehl, former political operative Beth Lindstrom, and philanthropist John Kingston — announced earlier this week that they each raised around $300,000 during the first three months of the year. Kingston, however, lent his campaign $3 million when he entered the race last year.

Earlier this month, former White House press secretary Sean Spicer attended a Boston fund-raiser for Diehl that netted over $30,000, according to the Diehl campaign.

Because Warren cuts such a high-profile figure in Washington politics — as a Democratic party favorite and one of President Trump’s chief foils — her biggest financial opposition may come not from local opponents, but from nationally funded super PACs looking to bruise the first-term senator on the airwaves here in Massachusetts ahead of a potential run for president.


Those groups can pop up with millions of dollars at any time, posing a yet unknown factor in the coming months.

James Pindell can be reached at james.pindell@globe.com. Follow him on Twitter @jamespindell or subscribe to his Ground Game newsletter on politics: http://pages.email.bostonglobe.com/GroundGameSignUp