Warren originally came to Washington as head of the government's official bailout watchdog, and later served as President Obama's architect of the Consumer Financial Protection Bureau (CFPB), which was created by the Dodd-Frank financial reform law.

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She had to drop out of the running to lead the CFPB and, ultimately, decided to run against Brown.

Heitkamp also will join both the Agriculture and Small Business panels.

“I am excited to work with the members of our expanded majority. Our caucus is more diverse than ever, with a record 16 female Democratic senators serving in the next Congress,” said Senate Majority Leader Harry Reid Harry Mason ReidGOP senators confident Trump pick to be confirmed by November Durbin: Democrats can 'slow' Supreme Court confirmation 'perhaps a matter of hours, maybe days at most' Supreme Court fight pushes Senate toward brink MORE (Nev.).

"These committee assignments will allow all members of our caucus to bring their unique talents and expertise to bear as we work together to advance the interests of the middle class."

The powerful Senate Finance Committee added Sens. Sherrod Brown Sherrod Campbell BrownMnuchin says he and Pelosi have agreed to restart coronavirus stimulus talks Harris faces pivotal moment with Supreme Court battle Remote work poses state tax challenges MORE (D-Ohio) and Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.), replacing the retiring Sens. Kent Conrad (D-N.D.) and Jeff Bingaman (D-N.M.).

Bennet, who was appointed to the seat in 2009 and elected in 2010, will shift from banking to finance. He picked up the plum seat after agreeing to take the reins of the Democratic Senatorial Campaign Committee.

“He has proven himself to be an up-and-coming leader who is always willing to reach across party lines,” Baucus said.

Baucus also praised Brown, who won a second six-year term in November, as "a fierce advocate for of the middle class."

Brown, who has opposed trade deals over concerns that they would force companies to ship jobs overseas, backed a bill last week to grant permanent normal trade relations (PNTR) with Russia. He argued that the bill included improvements over other PNTR deals and that it will help U.S. exporters.

“My biggest priority is to help build the middle class, and this committee provides a great opportunity to do so: from ensuring a fair tax code, to standing up for Ohio's manufacturers and workers when it comes to foreign trade, to protecting Social Security and Medicare,” Brown said.

Senate Agriculture added Indiana's Joe Donnelly Joseph (Joe) Simon DonnellyThe Hill's Morning Report - Sponsored by JobsOhio - Showdown: Trump-Biden debate likely to be nasty Senate Democrats want to avoid Kavanaugh 2.0 Trump taps Amy Coney Barrett for Supreme Court, setting up confirmation sprint MORE, while Appropriations added three to its rolls, all returning lawmakers: Sens. Tom Udall Thomas (Tom) Stewart UdallLWCF modernization: Restoring the promise OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency MORE (N.M.), Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenNew Hampshire poll finds Biden up 8 points over Trump Senate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen MORE (N.H.) and Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (Ore.).

Sen. Patty Murray Patricia (Patty) Lynn MurrayPoll finds support for independent arbiters resolving 'surprise' medical bills Senate Democrats introduce legislation to probe politicization of pandemic response Trump health officials grilled over reports of politics in COVID-19 response MORE (Wash.), the new chairman of the Budget Committee, will add newly elected Sens. Tammy Baldwin Tammy Suzanne BaldwinSenators introduce bipartisan bill to mandate digital apps disclose country of origin Keep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser MORE (Wis.), Tim Kaine Timothy (Tim) Michael KaineFears grow of chaotic election Trump taps Amy Coney Barrett for Supreme Court, setting up confirmation sprint Supreme Court fight pushes Senate toward brink MORE, the former governor of Virginia who won a tight race against former Sen. George Allen, and Angus King Angus KingHopes for DC, Puerto Rico statehood rise Government watchdog recommends creation of White House cyber director position Democrats step up hardball tactics as Supreme Court fight heats up MORE, an independent who opted to caucus with Democrats.

All survived close races to earn their first term in the upper chamber.

The Joint Economic Committee will add freshman Sen. Chris Murphy Christopher (Chris) Scott MurphyGOP online donor platform offering supporters 'Notorious A.C.B.' shirts Democratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (Conn.) and Sen. Martin Heinrich, a House member since 2009, who takes Bingaman's spot.

The Democratic Steering Committee approved the assignments on Wednesday.

The assignments are subject to approval by the full Democratic Caucus and approval of an organizing resolution by the full Senate when the 113th Congress convenes in January.