Most obnoxious example of “whataboutism”

[Vosem]

I don't think the second one is whataboutism; there was a concerted effort to paint the immigration policy as something which Trump invented or was uniquely responsible for, which wasn't true.

The first example is very obnoxious, though, because obviously any two individuals' rape accusations are different issues which don't have anything to do with each other. Pointing attention to the dissonant ways in which some specific person analyzed them might be valid for understanding that person, but few of the people condemning Trump for his scandals were actually very defensive of Clinton.

The third one seems to be in between the first two. While it is certainly relevant that Sanders voted for the bill if he wants to blame Biden for its contents, it is easy to imagine considerations that might've led Sanders to vote for it (fear of a worse replacement) in spite of disapproval of its contents.

Your first example is the most obnoxious.