It's a rare thing when a Tuesday puzzle really kills it. Even Bill Clinton will raise a chilly swill to the fill on this grid. But enough silliness. Let's drill down into this one.
Okay, truthfully, the clue and answer that made the whole puzzle for me came at 43A: Repeated cry when stabbing a vampire (DIE). I'm still laughing out loud at that one. Way to make a 3-letter answer pop. Perhaps nothing else quite rose to that level, but I enjoyed the puzzle anyway. You also get SCHERZO and COEXIST.
On the negative side, VAS, SAC, and FLAB all on the same row raise the question of whether the creator was thumbing his nose at aesthetics. To have two Chinese names, WEI and ZHOU, is unfortunate. And there's the random Roman numeral (CMVI).
But then, there's also CELTIC (far fallen from their heydays of the 80s and late 00s), PALMED, PATHOS, and DEFICIT.
Anyway, the theme itself is fun. I particularly like the pair of 15-letter down answers, each with a hidden pair of ILLs. I can never look at MILLARDFILLMORE's name, and not think of the cartoon strip, Mallard Fillmore. In fact, he is the president I routinely forget when I run through the list in my head (or on Sporcle).
Anyway, I enjoyed it overall.