Politics played a powerful role in Senate Democrats' committee assignments, announced on Wednesday, with many of the senators-elect who survived tough races given plum spots in powerful committees as a reward.

Sen. Michael BennetMichael Farrand BennetAmeriCorps hurricane heroes deserve a reward — don’t tax it Joe Buck defends 'nonviolent protests' at NFL games Patriotism is no defense for Trump’s attacks on black athletes MORE (D-Colo.), who agreed to take on the job of Democratic Senatorial Campaign Committee (DSCC) chairman during a cycle that looks less than favorable for Democrats, was rewarded for his trouble with a position on the Finance Committee, something he had expressed interest in before making his decision on the DSCC chairmanship.

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Bennet will give up his spots on the Banking and Aging committees to make time for his new responsibilities on the Finance Committee and as DSCC chairman, which will require him to travel the nation recruiting candidates and raising millions to protect the Democratic majority in the Senate. 

That task looks as daunting as it did two years ago, with 20 Democrats up for reelection — many in states Mitt Romney won this year — and only 13 Republican seats up in 2014.

But Democrats managed to expand their majority under outgoing DSCC Chairwoman Patty MurrayPatricia (Patty) Lynn MurrayChildren’s health-care bill faces new obstacles Overnight Health Care: Schumer calls for tying ObamaCare fix to children's health insurance | Puerto Rico's water woes worsen | Dems plead for nursing home residents' right to sue Schumer calls for attaching ObamaCare fix to children's health insurance MORE's (D-Wash.) watch and, following her efforts, she's been named chairwoman of the Budget Committee.

Other senators were rewarded for their campaign battles, including Sen.-elect Elizabeth WarrenElizabeth Ann WarrenOvernight Finance: Lawmakers grill Equifax chief over hack | Wells Fargo CEO defends bank's progress | Trump jokes Puerto Rico threw budget 'out of whack' | Mortgage tax fight tests industry clout Michelle Obama is exactly who the Democrats need to win big in 2020 Wells Fargo chief defends bank's progress in tense Senate hearing MORE (D-Mass.), who defeated Sen. Scott Brown (R-Mass.) in one of the nation's most prominent and pricy races.

Warren was the chief architect of the Consumer Financial Protection Bureau (CFPB), which was created by the Dodd-Frank financial reform law, and has long been a critic of Wall Street and big banks. She was given a seat on the Banking Committee, which has jurisdiction over Wall Street regulation and oversight.

She'll also serve on the Aging and Health, Education, Labor and Pensions committees.

Sen.-elect Heidi HeitkampMary (Heidi) Kathryn HeitkampWells Fargo chief defends bank's progress in tense Senate hearing Dems plan to make gun control an issue in Nevada Red-state Dems need more from Trump before tax embrace MORE (D-N.D.) was also given a spot on the Banking Committee, as well as the Agriculture, Small Business, Indian Affairs and Homeland Security and Government Affairs committees. She managed to pull out a surprise win against Rep. Rick Berg (R) on Election Night, despite Romney's sweep of the state by about 20 percentage points.

Farming is one of North Dakota's main economic drivers, and she pledged during her campaign to nab a seat on the Agriculture Committee, which oversees the creation and implementation of the farm bill.

And Sen.-elect Angus KingAngus Stanley KingSenate confirms No. 2 spot at HHS, days after Price resigns Overnight Defense: Mattis offers support for Iran deal | McCain blocks nominees over Afghanistan strategy | Trump, Tillerson spilt raises new questions about N. Korea policy Mattis: Staying in Iran deal is of US national security interest MORE, an independent from Maine, was rewarded for choosing to caucus with Democrats with seats on the powerful Budget, Armed Services, Rules and Intelligence committees.