Candidates locked in the nine tightest Senate races in the country raised over $57 million in the third fundraising quarter.

Several of these races remain too close to call, and these funds will be used to boost the candidates out of the margin of error and into the lead in the final three weeks of their campaigns.

Elizabeth WarrenElizabeth Ann WarrenKamala Harris will no longer accept corporate PAC money Pompeo faces pivotal vote Dem senators demand Trump explain ties to Koch brothers MORE, Democrat for Senate in Massachusetts, announced raising the largest haul — and outraised her opponent by the largest amount — of them all, and perhaps the largest of any Senate candidate nationwide. She raised $12.1 million in the third quarter, bringing her year-to-date fundraising total to $36.3 million — over $8 million more than GOP opponent Sen. Scott Brown.

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Brown's campaign said he brought in a considerable sum as well, but at $7.54 million, his fundraising total for the third quarter fell far short of Warren's. He's raised nearly $27.5 million for the year.

Democratic Rep. Joe DonnellyJoseph (Joe) Simon DonnellyRand's reversal advances Pompeo Overnight Defense: Pompeo clears Senate panel, on track for confirmation | Retired officers oppose Haspel for CIA director | Iran, Syria on agenda for Macron visit Pompeo headed for confirmation after surprise panel vote MORE, running for Senate in Indiana, faces a disadvantage similar to Brown's. Opponent Richard Mourdock raised twice as much as him in the third quarter, bringing in a $3 million haul.

Democrats in three other toss-up races bested their Republican opponents in fundraising for the third quarter. Rep. Tammy BaldwinTammy Suzanne BaldwinVulnerable Senate Dems have big cash advantages Dem senators unveil expanded public option for health insurance Dem senators call on FCC to protect against robocalls MORE brought in $1 million more than her opponent Tommy Thompson, posting a $4.6 million haul in the third quarter to Thompson's $3.6 million.

In Virginia, Democrat Tim KaineTimothy (Tim) Michael KaineHannity snaps back at 'Crybaby' Todd: 'Only conservatives have to disclose relationships?' Chuck Todd lashes out at Fox, defends wife in radio interview Overnight Defense: Trump steps up fight with California over guard deployment | Heitkamp is first Dem to back Pompeo for State | Dems question legality of Syria strikes MORE outraised Republican George Allen by a little less than $1 million. He posted $4.4 million in receipts for the third quarter, compared to Allen's $3.5 million.

And in Arizona, Richard Carmona outraised opponent Rep. Jeff FlakeJeffrey (Jeff) Lane FlakeWinners and losers from Jim Bridenstine’s confirmation as NASA administrator Manchin, Donnelly back Pompeo Juan Williams: GOP support for Trump begins to crack MORE for the second quarter in a row, this time by about $500,000. He brought in $2.2 million in the third quarter, while Flake brought in $1.7 million.

Most candidates, like Flake and Carmona, saw a disparity of only a few hundred thousand dollars in their third-quarter fundraising hauls.

Closest among the nine toss-up races was Montana, where Republican Rep. Denny Rehberg outraised Sen. Jon TesterJonathan (Jon) TesterNew allegations could threaten Trump VA pick: reports Overnight Health Care: Teen pregnancy program to focus on abstinence | Insurers warn against short-term health plan proposal | Trump VA pick faces tough sell Vulnerable Senate Dems have big cash advantages MORE by only about $100,000, with $2.4 million to Tester's $2.3 million. That reflects the razor-thin polling edge on which the race currently stands: The RealClearPolitics average of polls gives Rehberg a .3-point advantage over the incumbent.

Incumbent Dean HellerDean Arthur HellerSenate GOP wary of new tax cut sequel GOP Senate hopefuls race to catch up with Dems Family, friends mourn death of Barbara Bush MORE (R) outraised his challenger, Rep. Shelley Berkley (D), by a similarly small margin, bringing in $1.9 million to her $1.6 million.

And in North Dakota, it remains unclear how much separates Democrat Heidi HeitkampMary (Heidi) Kathryn HeitkampRand's reversal advances Pompeo Overnight Health Care: Teen pregnancy program to focus on abstinence | Insurers warn against short-term health plan proposal | Trump VA pick faces tough sell Overnight Defense: Pompeo clears Senate panel, on track for confirmation | Retired officers oppose Haspel for CIA director | Iran, Syria on agenda for Macron visit MORE from Rep. Rick Berg, as Heitkamp's campaign only revealed that the candidate raised $1.6 million in the third quarter, while Berg's campaign said he raised $1.57 million. Heitkamp's rounding of her total could obscure how close the numbers really are.

The candidates can't all use every dollar they reported raising from July 1 to Sept. 30. Donors can apportion funds for use in the primary or general elections, and candidates in Arizona, Connecticut, Wisconsin and Massachusetts all faced primaries during that period. Though they reported raising millions, in most cases, hundreds of thousands of the sum reported may have only been accessible for the first month or so of the quarter, the period in advance of their state's primary.

Every candidate but one in these toss-up races, Republican Linda McMahon, running in Connecticut, has reported total receipts for the third quarter. McMahon raised a record-breaking $20 million haul in the third quarter during her 2010 run, in part because of an influx of funds she contributed to her own campaign. Her opponent, Rep. Chris MurphyChristopher (Chris) Scott MurphyOvernight Cybersecurity: Senators want info on 'stingray' surveillance in DC | Bills to secure energy infrastructure advance | GOP lawmaker offers cyber deterrence bill Overnight Health Care: GOP pushes stiff work requirements for food stamps | Johnny Isakson opens up about family's tragic loss to opioids | Republicans refuse to back vulnerable Dem's opioids bill | Dems offer new public option plan Dems give muted praise to Pompeo-Kim meeting MORE, announced raising $3 million in the third quarter.