Eight years ago, I was very annoyed when McCain dropped out of the primaries much too early. Now, though, I’m annoyed by Clinton’s tenacity.
I think the big difference is that there was (emphasis on “was”) a bigger difference between Bush and McCain than there is between Obama and Clinton. There was a point in McCain staying in because there were differences to consider.
Or maybe just that even then I was in the “anybody but Bush” camp.