This one is a tough one for me. By simply flipping the ticket, would Bush/Quayle have lost? i.e. was Dukakis really
that poor of a candidate? I'm inclined to say that Bush/Quayle also benefitted from running as Reagan's 3rd term as much if not more than Dukakis campaign gaffes. That said, I have zero doubt Bentsen would have been a better fit for the top of the ticket, and would have done a better job of warming up the conservative Democrat elements of the party that were still relevant at that time. Texas certainly would have been a bloodbath, but I've got Bush still narrowly coming out on top while Bentsen pulls down petroleum state Louisiana, and carries the mid south states of Arkansas, Missouri, Kentucky, and narrowly looses Tennessee and Oklahoma. Bush holds the deep south, including carrying Florida comfortably. California, Michigan, Montana, and South Dakota are also close calls - Bush gets a clutch boost from a last-minute hard push from a Ronald Reagan road trip through California to excite the state's Republican base.
Bush/Quayle 302 EVs 50.5%
Bentsen/Dukakis 236 EVs 48.5%