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 MarkeySenate Democrats introduce bill to block Trump's refugee ban FCC votes to limit program funding internet access for low-income communities Two GOP senators oppose Trump’s EPA chemical safety nominee 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 Charles SchumerCharles (Chuck) Ellis SchumerJuan Williams: The politics of impeachment Texas Republicans slam White House over disaster relief request Dem rep: Trump disaster aid request is 'how you let America down again' MORE and LINO [Leader in Name Only] Harry ReidHarry ReidVirginia was a wave election, but without real change, the tide will turn again Top Lobbyists 2017: Grass roots Boehner confronted Reid after criticism from Senate floor MORE back the minority. Another month of 'progress NRSC,' " he said.