Amy McGrath, the Democrat who nearly flipped a conservative House district in Kentucky in 2018, raised nearly $11 million in the past three months for her bid to unseat Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.), her campaign said.

McGrath pulled in $10.7 million in the third fundraising quarter, the first since announcing her Senate campaign in July. That haul is made up of more than 299,000 contributions, her campaign said. The average donation size was $36.

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It’s a staggering haul for any Senate candidate, and especially a nonincumbent, exceeding the quarterly hauls of several presidential candidates. By comparison, Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.) raised $6 million for his White House bid, while Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) raised $4.8 million.

It’s only slightly less than the $11.6 million raised by Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.), one of the most well-known Democrats in the presidential field, in the past three months.

That financial haul is likely to put her in a strong position to take on McConnell next year. The top Senate Republican raised $2.3 million in the third quarter and has more than $9 million in the bank, his campaign told The Hill. He pulled in $1.8 million in the first quarter and another $2.5 million in the second.

Candidates for federal office are required to disclose their third-quarter fundraising hauls to the Federal Election Commission (FEC) by Oct. 15.

McGrath’s massive fundraising number signals just how eager Democrats are to oust McConnell in 2020. But if it’s a measure of Democratic enthusiasm, it’s also an acknowledgement of the uphill battle the party will face in trying to defeat a 35-year incumbent and one of the most influential Republicans in the country.

McConnell won reelection in 2014 by a nearly 15-point margin. And Kentucky has remained firmly in Republicans’ corner. President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE carried the state in 2016 by nearly 30 points, and all but one of Kentucky’s six House seats remain in GOP hands.

McGrath, a retired Marine Corps fighter pilot, rose to prominence in 2018 during her bid to unseat four-term Rep. Andy Barr Andy BarrReclaiming the American Dream Powell, Mnuchin stress limits of current emergency lending programs McConnell holds 12-point lead over Democratic challenger McGrath: poll MORE (R-Ky.) in Kentucky’s 6th District. That race, rated a toss-up by most election handicappers, ultimately ended in Barr’s favor. He defeated McGrath by little more than 3 points.

But that race also raised McGrath’s political profile and made her a top recruit to challenge McConnell for his Senate seat in 2020.

There are signs that the race between McGrath and McConnell could be close. A July poll conducted by pollster Fabrizio Ward for AARP showed McConnell with 47 percent support and McGrath with 46 percent support, a statistical tie given the survey’s 4-point margin of error.

Mark Nickolas, McGrath’s campaign manager, touted that poll and the candidate’s fundraising haul on Thursday as a sign of challenges to come for McConnell.

“Mitch McConnell has never faced an opponent like Amy McGrath,” Nickolas said in a statement. “Not only does a new independent poll show the race tied, but more than a quarter-million grassroots donations – from all 120 Kentucky counties – have provided us a record-shattering first quarter of nearly $11 million to take down McConnell and his self-serving special interest allies. Change is coming.”

Kevin Golden, McConnell's campaign manager, suggested that McGrath's fundraising was powered by donors outside of Kentucky, dismissing the financial haul as insignificant given McConnell's influence in the state and in Washington.

“Far-left liberal activists from New York and California absolutely hate the fact that Kentucky's values, culture and priorities are put at the front of the line as long as Mitch McConnell leads the Senate," he said. "They can flood her campaign with millions but they can't vote in Kentucky."

--Updated at 4:22 p.m.