Each of the committees the DSCC registered include different participants, although six candidates and the DSCC are included in both committees.

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The six benefiting from both are Sens. Amy KlobucharAmy Jean KlobucharOvernight Regulation: EPA sued over water rule delay | House passes bill to ease ObamaCare calorie rule | Regulators talk bitcoin | Patient groups oppose FDA 'right to try' bill Overnight Finance: Senators near two-year budget deal | Trump would 'love to see a shutdown' over immigration | Dow closes nearly 600 points higher after volatile day | Trade deficit at highest level since 2008 | Pawlenty leaving Wall Street group Dem senator presses FTC to ramp up Equifax hack probe MORE (Minn.), Maria CantwellMaria Elaine CantwellGreen group backs Sens. Baldwin, Nelson for reelection The US is falling behind in artificial intelligence research WHIP LIST: Shutdown looms as Senate lacks votes to pass House spending bill MORE (Wash.), and Kirsten GillibrandKirsten Elizabeth GillibrandBritish health secretary fires back at Trump over universal health care claims Trump on Dems’ ‘universal' health-care push: ‘No thanks’ Gillibrand calls for DOJ to investigate US Olympic Committee over abuse scandal MORE (N.Y.), Hawaii Senate candidate Rep. Mazie HironoMazie Keiko HironoGreen group backs Sens. Baldwin, Nelson for reelection WHIP LIST: Shutdown looms as Senate lacks votes to pass House spending bill Dem senator: Trump 'made clear' that he wants 'white people to come to our country' MORE, Wisconsin Senate candidate Rep. Tammy BaldwinTammy Suzanne BaldwinGreen group backs Sens. Baldwin, Nelson for reelection Dems press Trump for 'Buy American' proposals in infrastructure plan Protesters wearing blue fill hearing to protest Grassley ignoring 'blue slip rule' MORE and Nevada Senate candidate Rep. Shelley Berkley (Nev.). Of those, Berkley and Baldwin have the toughest races.

The joint fundraising committee designated with the New York address also benefits Sen. Claire McCaskillClaire Conner McCaskillGovernment watchdog finds safety gaps in assisted living homes GOP Senate candidate fundraising lags behind Dems in key races McCaskill challenger links human trafficking to 'sexual revolution' of 1960s MORE (Mo.), who is a top GOP target and considered one of the most vulnerable Democrats this cycle, along with North Dakota Senate candidate Heidi HeitkampMary (Heidi) Kathryn HeitkampHouse passes bill to ease menu labeling rules under ObamaCare In 2018, Trump must be the small-business champion he claimed to be GOP goes on offense with 20-week abortion vote MORE. The Washington committee includes Sen. Dianne FeinsteinDianne Emiel FeinsteinCoalition of 44 groups calls for passage of drug pricing bill An open letter to the FBI agent who resigned because of Trump Nunes 'memo' drama proves it: Republicans can't govern, they only campaign MORE (Calif.), according to disclosure documents.

There are six women incumbents running for reelection in the Senate and five who would be the first female senators in their states, if elected.

Joint fundraising committees are commonly used to help fill the campaign coffers. The money is distributed at the committee's discretion as long as the contributions stay within federal limits.

Adriane Rummel is the treasurer for both committees and is based out of the DSCC’s Washington, D.C., address, according to the FEC filings.

— This story was updated at 12:19 p.m.