https://www.pewresearch.org/fact-tank/2022/03/10/the-polariz...
The L has not moved very much, the level of street complaint, and asserts to the need to defend ground are not "moving futher left" they are a digging in, in-place.
Due respect to the writer, I think they're wrong.
I know former liberals who left the USA because of how far the Liberals have moved to the left. Rather live in China or Japan than the USA. Many tried for Canada but had a hard time getting an immigrant visa. In Japan you can start a business and sponsor yourself by hiring a business to do your paperwork.