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Illustration: Rebecca Zisser/Axios

We knew it was important, of course, but a new CNN poll released Tuesday shows it's solidly in the top of Democratic primary voters' issues for 2020.

By the numbers: 96% of Democrats and Democratic-leaning independents say it's very or somewhat important for a presidential candidate to promise aggressive action on climate change.

  • That's the highest of any of the issues polled, beating other Democratic favorites like Medicare for All (91%), executive action to tighten gun laws (85%), and tuition-free public college (78%).
  • Most Democrats feel strongly about it. 82% said it was very important to address climate change, while 14% said it was somewhat important.

Yes, but: A big caveat is that the Democratic sample was small — just 411 voters (it was a subsample in a larger national poll). That means the margin of error was 5.9 percentage points.

  • That's large enough that we can't be sure climate is the number one issue for Democrats. It could just as easily be health care, which isn't far behind.
  • But we can safely say that it's one of the top issues — higher than most other priorities — and that Democrats are passionate about it.

The bottom line: With numbers like these, it's no surprise that O'Rourke and Jay Inslee have put climate policy at the top of their agendas. And it will likely be harder for other candidates to get through the primary without spelling out detailed policies of their own.

Go deeper:

Go deeper

Trump impeachment trial to start week of Feb. 8, Schumer says

Senate Majority Leader Chuck Schumer. Photo: The Washington Post via Getty

The Senate will begin former President Trump's impeachment trial the week of Feb. 8, Majority Leader Chuck Schumer announced Friday on the Senate floor.

The state of play: Schumer announced the schedule after reaching an agreement with Republicans. The House will transmit the article of impeachment against the former president late Monday.

1 hour ago - Health

CDC extends interval between COVID vaccine doses for exceptional cases

Photo: Joseph Prezioso/AFP via Getty

Patients can space out the two doses of the coronavirus vaccine by up to six weeks if it’s "not feasible" to follow the shorter recommended window, according to updated guidance from the Centers for Disease and Control and Prevention.

Driving the news: With the prospect of vaccine shortages and a low likelihood that supply will expand before April, the latest changes could provide a path to vaccinate more Americans — a top priority for President Biden.

Texas AG sues Biden administration over deportation freeze

Texas Attorney General Ken Paxton speaks to members of the media in 2016. Photo: Alex Wong/Getty Images

Texas Attorney General Ken Paxton is suing the Biden administration in federal district court over its 100-day freeze on deporting unauthorized immigrants, and he's asking for a temporary restraining order.

Between the lines: The freeze went into effect Friday, temporarily halting most immigration enforcement in the U.S. In the lawsuit, Paxton claims the move "violates the U.S. Constitution, federal immigration and administrative law, and a contractual agreement between Texas" and the Department of Homeland Security.