Danke, both of you, but not original to me. First saw it either here or at Balloon Juice - not sure which, but I think it was here at TPM. Wish I could remember the name of the person I first saw use it, so I could credit them.
Edited to Add: Okay, I think I found it. The earliest use of Benedict Donald I’ve found is from Spencer’s Mom on July 27, 2016 - even before Donald was elected. I’m pretty sure that’s where I first read it too:
If I recall correctly, it’s the same day (or the day after) Trump publicly called for the Russians to hack Clinton’s email account. So, I’m guessing we can credit Spencer’s Mom with either originating it, or at least being the first to use it at TPM.