The Democratic Senatorial Campaign Committee outraised its Republican counterpart by just over $1 million in the month of May, bringing in $4.9 million to the National Republican Senatorial Committee's $3.6 million, according to committee sources.

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The DSCC now has about $10 million cash on hand, while the NRSC has just over $7 million.

The DSCC has outperformed the NRSC in terms of fundraising nearly every month this year, aside from April, when the NRSC raised slightly more.

Democratic fundraising numbers were boosted by help from President Obama, who has headlined a number of DSCC fundraisers throughout the first half of the year, including a handful in May.

The DSCC wouldn't say how much it had spent in the last month — or how much debt it was carrying. As of the end of April, the organization had $8.6 million in the bank and $13.8 million in debt.

The organization has spent at least $700,000 in the past month to help Rep. Edward MarkeyEdward (Ed) John MarkeyDem senators demand Trump explain ties to Koch brothers Overnight Cybersecurity: Senators want info on 'stingray' surveillance in DC | Bills to secure energy infrastructure advance | GOP lawmaker offers cyber deterrence bill Overnight Tech: Alleged robocall kingpin testifies before Congress | What lawmakers learned | Push for new robocall rules | Facebook changes privacy settings ahead of new data law | Time Warner CEO defends AT&T merger at trial MORE's (D-Mass.) Senate campaign.

The NRSC reported $8 million in debt, indicating they've paid down $1.5 million since the last report.

NRSC Communications Director Brad Dayspring said Republicans believe consistent debt plaguing the DSCC is an indication the GOP is in a better financial position going forward.

"Our goal has been to keep showing steady progress each month, raising the resources needed to send Chuck SchumerCharles (Chuck) Ellis SchumerThrowing some cold water on all of the Korean summit optimism House Republicans push Mulvaney, Trump to rescind Gateway funds Congress should build on the momentum from spending bill MORE and LINO [Leader in Name Only] Harry ReidHarry Mason ReidDems walk tightrope on Pompeo nomination The Memo: Teens rankle the right with gun activism Dems to party: Go on offense with Trump’s alleged affairs MORE back the minority. Another month of 'progress NRSC,' " he said.