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Labour Party Leader Jeremy Corbyn and U.K. Prime Minister Theresa May. Photos: Ian Forsyth/Getty Images; Dan Kitwood/Getty Images

The U.K.'s divides over a Brexit deal are often summarized in jargon unintelligible to a casual watcher of world politics — the backstop, customs unions and common markets — but the key driver is something much more familiar: political polarization.

The big picture: The two major parties are both bitterly divided between each other, and among themselves. Red lines from regional parties based in Northern Ireland and Scotland make compromise more difficult still. Those faction-driven politics have made consensus elusive on an issue that will have lasting economic and societal impacts for decades.

  • You see it in the Conservative Party's long-foreseen inability to back a reasonably negotiated Brexit deal from Prime Minister Theresa May — while simultaneously refusing to trigger a leadership contest that could inject fresh thinking.
  • You see it in an opposition Labour Party that's ruled by the far left at the grassroots but mostly center-left in government, creating an untenable dichotomy that's left it unable to present a clear alternative to May.
  • You see it in the actions of Northern Ireland's conservative Democratic Unionist Party and the leftist Scottish National Party, whose existential mandates logically require them to be beholden to both political ideology and their respective parts of the U.K.

The Conservative state of play: Dozens of members of the arch-Brexiteer European Research Group voted against May's deal for Brexit — a policy outcome to which many have dedicated decades of their political lives.

The Labour state of play: The New York Times has an excellent piece on the political dilemma currently facing Labour's leader, Jeremy Corbyn, a far-left Eurosceptic leading a party increasingly split along socioeconomic lines.

  • "Should they stand up for open borders and multiculturalism and risk cutting loose white workers who have drifted to the anti-immigrant right? Or try winning back those voters with a liberal version of the fight against global institutions, trade pacts and migration?"

What's next: If the parties in power can't agree to some sort of deal, there's been talk of a second referendum to determine what's next for Brexit — but that presents its own mess of polarized problems because no one has any idea what the choices should be.

  • Those on the left will argue that "remain" has to be an option — and say that the political difficulties outlined above weren't originally clear to voters — while the right argues that the decision to leave is final.
  • Those on the far-right will argue that a clean, "no deal" Brexit should be an option — despite the economic issues that it could bring — which would split Brexit supporters if paired with a softer option, possibly allowing "remain" to prevail.

The bottom line: There's little support in Westminster for a "no deal" Brexit, but with the deadline approaching and the sides as far apart as ever, the U.K. could well stumble over that cliff's edge on March 29.

Go deeper: Brexit's future looks murkier than ever

Go deeper

37 mins ago - Health

CDC prepares tougher testing rules for international travelers

Travelers with their luggage arrive at a COVID-19 testing location at the airport in Los Angeles, Calif., on Nov. 23, 2021. Photo: Frederic J. Brown/AFP via Getty Images

The Centers for Disease Control and Prevention said Tuesday night that it is working to impose stricter testing requirements for international travelers due to the spread of the new Omicron variant.

The big picture: The new rules would require all international travelers, regardless of vaccination status, to show a negative test taken a day before their flight to the U.S. Currently, the CDC says fully vaccinated travelers are allowed to show a test taken no more than three days before their departure, AP reports.

Republicans threaten to shut down government over vaccine mandates

Sen. Mike Lee (R-Utah) in the Capitol in November 2020. Photo: Joshua Roberts/Getty Images

Conservative Republicans in the House and Senate are planning to force a government shutdown Friday to deny funding needed to enforce the Biden administration's vaccine mandates on the private sector, according to Politico.

Why it matters: Congress has until the end of the week to pass a stopgap measure to extend funding into 2022, though objection from a small group of Republicans could shut down the government.

Electric car prices could go up before they come down

Illustration: Eniola Odetunde/Axios

The secret to affordable electric vehicles is cheaper batteries. But after years of falling prices, battery costs are now headed in the wrong direction.

Why it matters: Costlier batteries could drive up the price of electric vehicles — threatening the auto industry's transition away from fossil fuels, and, in turn, society's fight against climate change.