Democratic U.S. Senator Elizabeth Warren raised more than $2.9 million during the past three months, just under the $3.1 million she pulled in during the first quarter of the year.
Warren's campaign said Tuesday she ended June with about $15.6 million on hand. The vast majority of those contributions, about 94 percent, came in $50 donations or less.
Warren said in an email to supporters she's on the cusp of hitting one million donations for her re-election bid. She said during her 2012 campaign she hit 600,000 donations by Election Day.
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Three Republicans hope to unseat Warren in November, including state Rep. Geoff Diehl, former Mitt Romney aide Beth Lindstrom and businessman John Kingston.
Kingston said he raised $316,000 in the second quarter, bringing his cash total to $2.6 million.