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BOSTON — U.S. Sen. Elizabeth Warren has been raising more than $1 million a month this year as she bulks up her campaign account ahead of the 2018 election.

A Warren campaign aide says the Massachusetts Democrat raked in about $3 million during the past three months. That leaves her with $12.8 million in cash.

Her third quarter haul was slightly less than the $3.4 million she raised during the second quarter of the year and down from the $5.2 million she raised during the first quarter.

Warren's campaign said 78 percent of the third quarter donations were $25 or under.

Republicans hoping to unseat Warren include one-time Mitt Romney aide Beth Lindstrom, state Rep. Geoff Diehl, technology entrepreneur Shiva Ayyadurai and businessman John Kingston, who has poured $3 million into his own campaign.