I can't remember where I saw that now, but a quick trawl found this bunch of bullet points in the Daily Mail (I definitely didn't first read it there!). Apparently, the figures were obtained in a YouGov poll of 1500 Americans. Hmm. Daily Mail...YouGov... *gulp*

-Americans by a wide margin disapprove of the pro-Trump attack on the Capitol
-But the number of people who endorse it has grown these past two years
-The share of approving Americans has risen from 9 to 20 percent
-Startlingly, the biggest shift in opinion has been among Democrats
-The share of approving Democrats has risen from 3 to 16 percent

Details, if you really want them, in the Mail if you google "Support for the January 6 attack on the US Capitol has more than doubled..."