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 KavanaughTrump wishes Ginsburg well after radiation treatment for tumor Ginsburg completes radiation treatment for cancerous tumor Mississippi professor, who went to Georgetown Prep with Brett Kavanaugh, sues HuffPost MORE.

The Senate Leadership Fund, a super PAC aligned with Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTwo years after Harvey's devastation, the wake-up call has not been heeded McGrath releases ad blasting McConnell with coal miners in Kentucky: 'Which side are you on?' Prediction: 2020 election is set to be hacked, if we don't act fast MORE (R-Ky.), hit the Alabama Democrat in a press release last week over his vote to reelect Sen. Charles SchumerCharles (Chuck) Ellis SchumerJewish Democratic congresswoman and veteran blasts Trump's 'disloyalty' comments Schumer says Trump encouraging anti-Semites Saagar Enjeti: Biden's latest blunder; Krystal Ball: Did Schumer blow our chance to beat McConnell? MORE (D-N.Y.) as minority leader.

Maine

Democrats are bullish about their chances of ousting Sen. Susan CollinsSusan Margaret CollinsAn ode to Joe Manchin's patriotism on his birthday Susan Collins challenger hit with ethics complaints over reimbursements Overnight Health Care: Insurance lobby chief calls Biden, Sanders health plans 'similarly bad' | Trump officials appeal drug price disclosure ruling | Study finds 1 in 7 people ration diabetes medicine due to cost 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 PoliquinThe Hill's Morning Report - Mass shootings put spotlight on Trump, Congress Ex-GOP lawmaker from Maine says he won't run for his old seat in 2020 Making the case for ranked-choice voting 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 FlakeAnti-gun violence organization endorses Kelly's Senate bid Arpaio considering running for former sheriff job after Trump pardon Overnight Energy: Warren edges past Sanders in poll of climate-focused voters | Carbon tax shows new signs of life | Greens fuming at Trump plans for development at Bears Ears monument 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 McCainCindy McCain says late husband would be 'very disappointed' with politics today What would John McCain do? Sunday shows preview: Trump ratchets up trade war with China 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 McSallyGabby Giffords participating in gun violence town hall in El Paso following mass shooting Poll shows Biden, Warren tied with Trump in Arizona Anti-gun violence organization endorses Kelly's Senate bid 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 GardnerHickenlooper day-old Senate bid faces pushback from progressives The Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch The Hill's 12:30 Report: Democratic field narrows with Inslee exit MORE (R) in 2020.

Hillary ClintonHillary Diane Rodham ClintonTrump preps conspiracy theory to explain faltering economy The ideological divide on vaping has a clear winner: Smokers Biden struggles to hit it off with millennials MORE beat Trump in Colorado by roughly 5 points in 2016. And earlier this month, Democrat Jason CrowJason CrowSecond Democrat representing Trump district backs impeachment House Democrats request sit-down with McConnell to talk guns Assault weapons ban picks up steam in Congress MORE ousted Rep. Mike CoffmanMichael (Mike) Howard CoffmanBottom Line Koch political arm endorses Colorado Sen. Gardner 20 years after Columbine, Dems bullish on gun reform MORE (R).

In the race for governor, Democrat Jared PolisJared Schutz PolisColorado governor pokes fun at FaceApp Number of openly LGBTQ elected officials rose nearly 25 percent since 2018: report GOP gun rights activist arrested for flashing handgun at U.S. marshal 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 ErnstBill Maher says he's 'glad' David Koch is dead Five things to know about David Koch A cash advance to consider 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.