[throwawaysea]

The second link's poll includes a breakout of Democrats' beliefs in what Democrats believe, in addition to the overall figures. So 65% of Democrats agreed at the time that Democrats don't accept Trump as the legitimate president. I realize it's not the same exact question, but it is similar. There are also other polls that I didn't include that you can find with similar results.

As for the fourth link - I am not sure of the timing of that particular poll (I just pulled that from a search earlier), so I'll have to take your word on that. Thanks for pointing it out.