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 KlobucharAmazon primed for merger battle Time to get Trump’s new antitrust cop on the beat Going national with automatic voter registration MORE (Minn.), Maria CantwellMaria CantwellDems push for more action on power grid cybersecurity Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief Dems urge Sessions to reject AT&T-Time Warner merger MORE (Wash.), and Kirsten GillibrandKirsten GillibrandSenate Democrats: ObamaCare repeal fight isn't over yet Bipartisan senators seek to boost expertise in military justice system Mattis gaining power in Trump’s Cabinet MORE (N.Y.), Hawaii Senate candidate Rep. Mazie HironoMazie HironoSenate Dems step up protests ahead of ObamaCare repeal vote Senate Dem: Gorsuch, Thomas and Alito like 'horsemen of the apocalypse' Dems push for more action on power grid cybersecurity MORE, Wisconsin Senate candidate Rep. Tammy BaldwinTammy BaldwinMajor progressive group rolls out first incumbent House endorsement Dems push for more action on power grid cybersecurity Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief 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 McCaskillMcCaskill attended reception at Russian ambassador's residence in 2015 Senators question need for HHS cyber office Overnight Cybersecurity: Obama DHS chief defends Russian hack response | Trump huddles on grid security | Lawmakers warned about cyber threat to election systems 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 HeitkampHeidi HeitkampSenate Democrats: ObamaCare repeal fight isn't over yet Dem senator: Don't bet against McConnell on ObamaCare repeal Senate Dem undecided on 2018 reelection run MORE. The Washington committee includes Sen. Dianne FeinsteinDianne FeinsteinGraham gets frustrated in public ‘unmasking’ debate Dem senators urged Obama to take action on Russia before election Senate panel questions Lynch on alleged FBI interference 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.