When I do a Brave search for the past week for UFO: https://search.brave.com/search?q=ufo&source=desktop&tf=pw, I see:
The Hill
Yahoo
NY Mag
Popular Mechanics
NewsWeak
MSN
WaPo
BBC (overseas, but quite lefty)
NBC
And on and on and on and on and on...
And, frankly, there weren't any liberal sources of note.
You mentioned coverage by the Washington Post. I couldn't find such. Do you have a link to the WaPo story?
As an aside, Ross Coulthart, the Australian journalist who has been covering this story, has spoken loudly and boldly about the failure of major media in the U.S. in covering this story. He alleges they are under the thumb of the Pentagon or the CIA (i.e., if they cover this story positively, they will be kicked out of the respective press pools).
Until someone planks down the body of a rapidly cooling alien, I will remain dedicated to human supremacy.
I reckon that makes me a Wihte Supremacist, LOL.