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Senate races 2020: Which seats could flip and determine the balance of power?

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Although much of the nation's attention is focused on the race for the presidency between President Trump and Democratic nominee Joe Biden, there are also several toss-up Senate races this year that will determine whether the Senate remains in Republican hands or is taken by a Democratic majority.

To take the majority, Democrats would have to net three seats, should Biden win the presidency, or four seats, if Mr. Trump wins reelection, because it's the vice president who breaks ties in the Senate. Republicans had a 53-47 

Here is a rundown of the key Senate races and CBS News' projected winners as of early Wednesday: 

Alabama

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Alabama Sen. Doug Jones (D); Senate candidate Tommy Tuberville (R) AP Photo/Andrew Harnik; Butch Dill

Winner: Tommy Tuberville (R)

Many consider Democrat Doug Jones' tenure as a senator from ruby-red Alabama to be a fluke. He won the seat in a 2017 special election to fill the vacancy left by Jeff Sessions, who became Mr. Trump's first attorney general. Jones narrowly defeated Republican candidate Roy Moore, who faced multiple allegations of sexual misconduct with underage girls. This year, Jones was less fortunate in his opponent — he was challenged by Tommy Tuberville, the well-known, well-loved former coach of the Auburn University football team. 

Arizona

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Arizona Sen. Martha McSally; Senate candidate Mark Kelly (D) Caitlin O'Hara/Getty Images, Kimberly White/Getty Images

Winner: Toss-up

Republican Senator Martha McSally was appointed to her position months after losing to Senator Kyrsten Sinema by under 3 points in the race for the state's other Senate seat in 2018. This year's election is another test of whether she can win the state. This time she's facing Democrat Mark Kelly, a former astronaut and the husband of former Congresswoman Gabby Giffords, a gun control activist who was shot in 2011. 

McSally has been an ally of Mr. Trump and appeared with him when he visited the state amid the coronavirus pandemic. His coattails could be shrinking in 2020, however. Mr. Trump won Arizona by about 3.5 points, while in 2012, Mitt Romney carried the state by 10 points against President Obama. Now, in the week before Election Day, CBS News' Battleground Tracker shows Joe Biden with a five-point lead over Mr. Trump, 51% to 46%. The Cook Political Report rates this race as "Lean Democratic."

Colorado

Spring Fire
Then Colorado Governor John Hickenlooper and U.S. Senator Cory Gardner discuss the Spring Fire during a press conference at the Sierra Grande School grounds in Fort Garland, July 5, 2018.  Andy Cross/The Denver Post via Getty Images

Winner: John Hickenlooper (D)

Incumbent first-term Senator Cory Gardner, a Republican, was defeated by former Governor John Hickenlooper. After a brief primary presidential bid, Hickenlooper decided to run for Senate. Gardner is considered one of the most vulnerable Republican senators up for reelection this year — he's the only major statewide elected GOP official. Gardner was trailing Hickenlooper in polls leading up to Election Day. 

Georgia

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Republican Senator David Perdue of Georgia and opponent Jon Ossoff. (left) Michael Brochstein/SOPA Images/LightRocket via Getty Images and (right) Paras Griffin/Getty Images

Ossoff vs. Perdue: Toss-up

Georgia has two high-profile Senate races this year, thanks to a contentious special election. GOP Senator David Perdue is defending his seat from Democratic challenger Jon Ossoff, who ran for the House unsuccessfully a few years ago. CBS News estimates this race is 

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Georgia Sen. Kelly Loeffler (R); Rep. Doug Collins (R); Rev. Raphael Warnock Getty Images

Special election: Warnock, Loeffler to go to runoff

Meanwhile, Republican Senator Kelly Loeffler is running to hang on to the seat that she was appointed to fill in December 2019 when Senator Johnny Isakson retired early. This special election had 21 candidates, but her main competition came from GOP Congressman Doug Collins.

The top two vote-getters, Loeffler and Democrat Raphael Warnock, will be in a runoff that is scheduled to take place on January 5. 

Iowa

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Iowa Senator Joni Ernst (R) and Senate candidate Theresa Greenfield (D) L: Olivier Douliery/AFP/Bloomberg via Getty Images; R: Photo by Caroline Brehman/CQ Roll Call

Winner: Joni Ernst (R)

Republican Senator Joni Ernst was challenged by Democrat Theresa Greenfield in an unexpectedly close race where Ernst ultimately prevailed, CBS News projects. Mr. Trump won Iowa by 10 percentage points in 2016, and won the state again by a narrower margin this year.

Greenfield raised far more than Ernst — $28.7 million in the third quarter — and she could end up outspending Ernst by more than $25 million by Election Day.  

Though Greenfield is a political neophyte, she has earned the endorsement of three Iowa newspapers, including the Des Moines Register, which said about Iowa businesswoman, "Theresa Greenfield is not a practiced politician. That makes her all the more appealing to represent Iowans in the U.S. Senate." The editorial board criticized Ernst for her support of the GOP tax cut, her defense of President Trump during his impeachment and for casting doubt on the count of people who have died of COVID-19.

Maine

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File: L-R: Maine Sen. Susan Collins (R); Senate candidate Sara Gideon (D) Al Drago/Bloomberg via Getty Images; Sarah Rice/Bloomberg via Getty Images

Winner: Susan Collins (R)

Senator Susan Collins won her fifth term on Wednesday, solidifying her appeal among Maine voters as one of the most moderate Republicans in the Senate. She faced considerable skepticism from Democrats and independents who previously supported her. 

Although she supports abortion rights, Collins voted in favor of Justice Brett Kavanaugh's confirmation in 2018, despite his anti-abortion rights record. She was the lone Republican to vote against the confirmation of Supreme Court Justice Amy Coney Barrett. "I do not think it is fair nor consistent to have a Senate confirmation vote prior to the election," she said.

Collins was considered one of the possible swing voters Mr. Trump's impeachment trial, but ultimately she voted to acquit him. She said at the time she believed he had "learned" from the experience, putting her in the crosshairs of national Democrats. 

State Speaker of the House Sara Gideon was the Democratic candidate, and posted record fundraising. However, as with other closely contested Senate races, money was not enough to ensure her victory.

Michigan

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Michigan Sen. Gary Peters (D); Senate candidate John James (R) AP Photo/Carolyn Kaster; Paul Sancya

Winner: Toss-up

Michigan is a key battleground state in the presidential election as well as in the Senate, as Mr. Trump defeated Hillary Clinton by an incredibly narrow margin in 2016. First-term Democratic Senator Gary Peters is up for reelection and is running against Republican John James, who unsuccessfully ran for Senate in 2018. 

James has outraised Peters, and Mr. Trump's strong performance in the state has some national Democrats nervous. But polls have been showing Peters leading James, and Cook Political Report rates this race "Lean Democratic."

Montana

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Montana Sen. Steve Daines (R); Gov. Steve Bullock (D) William Campbell/Getty Images; Tom Williams/CQ-Roll Call, Inc via Getty Images)

Winner: Steve Daines (R)

First-term Republican Senator Steve Daines defeated the two-term governor of his state, Steve Bullock. Like Hickenlooper, Bullock briefly ran for president before ending his bid and entering the Senate race in March 2020. Bullock won reelection in Montana as a Democrat in 2016 even as Donald Trump won the state by about 20 points. 

North Carolina

Election 2020 Senate North Carolina
File: Democratic challenger Cal Cunningham, left, and U.S. Sen. Thom Tillis, R-N.C. talk during a televised debate Thursday, October 1, 2020 in Raleigh, N.C. Gerry Broome / AP

Winner: Toss-up

The closely- watched North Carolina Senate race has seen a couple of October surprises. Incumbent Senator Thom Tillis, a Republican, tested positive for COVID-19. Democrat Cal Cunningham became embroiled in a sex scandal. Neither development upended the race, which remains is extremely close. 

Tillis is a member of the Judiciary Committee, and Cunningham has slammed the senator for reversing his position on filling a Supreme Court seat ahead of the election. 

If it is close, we may have to wait a few days to find out the outcome, since absentee ballots postmarked by Election Day and received within three days afterward will be counted.

South Carolina

Senate Democratic Candidate Jaime Harrison Unveils 'Rural Hope Agenda'
Jaime Harrison and Senator Lindsey Graham. Bloomberg/Getty Images

Winner: Lindsey Graham (R)

Senate Judiciary Committee Chairman Lindsey Graham faced a closer than expected reelection race, but still ended up victorious against Democrat Jaime Harrison. Graham led the high-profile confirmation hearings for Judge Amy Coney Barrett to the Supreme Court, and Harrison is hitting him for his reversal on confirming a Supreme Court nominee in a presidential election year. 

Eleanor Watson, Aaron Navarro and Sarah Ewall-Wice contributed to this report.

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