The 5 most competitive Senate races of 2020

The 2020 elections are set to flip the script in the battle for the Senate, as Republicans must defend at least 20 seats, teeing up a series of potentially competitive races that could alter the political map.

Republicans have so far expanded their Senate majority going into 2019 to 52 seats. They could pick up one more if Sen. Cindy Hyde-Smith (R-Miss.) emerges victorious in her runoff election against Democrat Mike Espy, a former congressman and agriculture secretary.

But Democrats have already put a number of Senate seats in their sights as they look to recapture a majority in the chamber in 2020. Meanwhile, Republicans are eager to win back the Alabama seat currently held by Sen. Doug Jones (D).

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Here are five Senate races that are shaping up to be among the most competitive in 2020.

Alabama

Jones eked out a win in his 2017 special election bid against a Republican candidate shrouded in scandal and controversy. But as he prepares to run for his first full term in 2020, it’s unclear if he’ll be able to hold on in deep-red Alabama.

Alabama is the only solidly Republican state where a Democrat will face reelection in 2020, and while Jones doesn’t yet have a top-tier challenger, the GOP is already eyeing his seat as its best pick-up opportunity in the next election.

What’s more, Republicans are likely to go after Jones on his record in the Senate thus far, such as his vote against the confirmation of Supreme Court Justice Brett KavanaughBrett Michael KavanaughDems escalate gun fight a year after Parkland Virginia political scandals show why words, and their delivery, truly matter In Virginia, due process should count more than blind team support MORE.

The Senate Leadership Fund, a super PAC aligned with Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellBill Kristol resurfaces video of Pence calling Obama executive action on immigration a 'profound mistake' Winners and losers in the border security deal House passes border deal, setting up Trump to declare emergency MORE (R-Ky.), hit the Alabama Democrat in a press release last week over his vote to reelect Sen. Charles SchumerCharles (Chuck) Ellis SchumerBill Kristol resurfaces video of Pence calling Obama executive action on immigration a 'profound mistake' House passes border deal, setting up Trump to declare emergency Christie: Trump doesn’t give nicknames to people he respects MORE (D-N.Y.) as minority leader.

Maine

Democrats are bullish about their chances of ousting Sen. Susan CollinsSusan Margaret CollinsGOP braces for Trump's emergency declaration DOJ warns White House that national emergency will likely be blocked: report On The Money: Trump to sign border deal, declare emergency to build wall | Senate passes funding bill, House to follow | Dems promise challenge to emergency declaration MORE (R) in 2020.

Democrat Janet Mills easily won her bid to succeed retiring Republican Gov. Paul LePage this year, leaving Collins as the last remaining GOP statewide elected official. And with the defeat of Rep. Bruce PoliquinBruce Lee PoliquinMaine governor certifies Dem's win in disputed House race, but calls it 'stolen election' GOP lawmaker to drop challenge to Maine's new voting system GOP lawmaker to appeal judge's ruling upholding Maine's new voting system MORE (R-Maine) in Maine’s 2nd District, both of the state’s House members will be Democrats.

What’s more, the state has gone blue in every presidential election since 1988.

Collins incensed liberals last month when she voted to confirm Kavanaugh to the Supreme Court, prompting warnings of an aggressive push to boot her from office. Already, one prominent Democrat, former national security adviser Susan Rice, has floated the idea of challenging the four-term senator in 2020.

But Collins has a history of winning outsize reelection victories. In 2008, a bad year for Republicans, she crushed former Rep. Tom Allen (D) by a whopping 23 points. She won reelection once again in 2014 by a 37-point margin.

Arizona

Republicans have held both of Arizona’s Senate seats for well over two decades. But as evidenced by Democrat Kyrsten Sinema’s victory in the race to succeed retiring Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeTrump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Live coverage: Trump delivers State of the Union Sasse’s jabs at Trump spark talk of primary challenger MORE (R) this month, the state’s hue is becoming more purple.

The 2020 Senate election in Arizona is set to determine who will fill the seat once occupied by the late Sen. John McCainJohn Sidney McCainMark Kelly's campaign raises over M in days after launching Senate bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Lawmakers wait for Trump's next move on border deal Mark Kelly launches Senate bid in Arizona MORE (R), a political giant who passed away earlier this year from brain cancer.

Arizona Gov. Doug Ducey (R) appointed Jon Kyl, a former Republican senator, to fill the seat after McCain’s death. But Kyl has said he does not intend to seek election in 2020, setting up the possibility of a highly competitive primary and making the seat a prime target for Democrats.

But Republicans are unlikely to cede the state without an aggressive fight. Kyl is considering leaving the Senate seat ahead of 2020, and speculation has swirled that Ducey could name outgoing Rep. Martha McSallyMartha Elizabeth McSallyPoll shows McSally, Kelly tied in Arizona Senate race Mark Kelly's campaign raises over M in days after launching Senate bid Overnight Defense: House votes to end US support for Saudis in Yemen | Vote puts Trump in veto bind | Survey finds hazards in military housing | Senators offer new bill on Russia sanctions MORE (R), who lost her Senate bid to Sinema, as Kyl’s replacement.

If that happens, it could give McSally a second shot at the Senate seat and give Republicans an experienced candidate with an already high profile.

Colorado

Colorado has long been considered among the nation’s perennial battleground states. But that reputation appears to be waning, setting up a potentially tough reelection environment for Sen. Cory GardnerCory Scott GardnerBipartisan Senators reintroduce legislation to slap new sanctions on Russia Dems seeking path to Senate majority zero-in on Sun Belt Lawmakers eager for 5G breakthrough MORE (R) in 2020.

Hillary ClintonHillary Diane Rodham ClintonO’Rourke heading to Wisconsin amid 2020 speculation The Hill's 12:30 Report — Presented by Kidney Care Partners — Lawmakers scramble as shutdown deadline nears Exclusive: Biden almost certain to enter 2020 race MORE beat Trump in Colorado by roughly 5 points in 2016. And earlier this month, Democrat Jason CrowJason CrowGardner gets latest Democratic challenge from former state senator Gardner, Portman endorse Trump for 2020 How Pelosi is punishing some critics while rewarding others MORE ousted Rep. Mike CoffmanMichael (Mike) Howard CoffmanTrump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Gardner gets latest Democratic challenge from former state senator Gardner, Portman endorse Trump for 2020 MORE (R).

In the race for governor, Democrat Jared PolisJared Schutz PolisKey Colorado House committee passes bill to decide presidential elections by popular vote, not Electoral college Gardner gets latest Democratic challenge from former state senator Gardner, Portman endorse Trump for 2020 MORE notched a comfortable win over Republican Walker Stapleton. Perhaps more notable is that the 2018 midterms gave Democrats control of every statewide office in Colorado, as well as majorities in both the state House and Senate.

All told, that sets the stage for a potentially fierce Senate battle in 2020. Gardner, chairman of the National Republican Senatorial Committee, has proven to be an adept campaigner. But his Senate seat is high on Democrats’ wish list as they seek to flip the last remaining Republican-held statewide office in their favor.

Iowa

Iowa may have handed Trump a nearly 10-point win in 2016, but the Hawkeye State holds a reputation as a perennial battleground, setting the stage for a fiercely competitive Senate race in 2020 when Sen. Joni ErnstJoni Kay ErnstPush for paid family leave heats up ahead of 2020 Ivanka Trump to meet with GOP senators to discuss paid family leave legislation On The Money: Negotiators aiming to reach deal Monday night | Why border talks stalled | Treasury calls reports on dip in tax refunds 'misleading' | Cuomo, Trump to discuss SALT deduction cap MORE (R-Iowa) is expected to seek a second term.

Democrats managed to flip two of Iowa’s Republican-held House seats earlier this month, meaning that the state’s congressional delegation will be evenly split between the two parties next year.

Former President Obama also carried the state in his 2008 and 2012 White House bids.

But there’s a silver lining for the GOP. The state’s Republican Gov. Kim Reynolds won a second term this month and her party held their majorities in the state House and Senate, maintaining the GOP’s trifecta in Des Moines.

Just missing the cut: North Carolina

North Carolina’s political future is in flux. The state has seen a surge in new residents in recent years, particularly in suburban areas and cities, such as Charlotte, that could create a more Democratic-friendly electorate. 

At the same time, Democrats chipped away at the GOP’s supermajority in the state General Assembly this month. Still, Democrats didn’t see the same kind of success in U.S. House races in the state in 2018.