My prediction of the 1992 map without Perot...
Perot makes all the difference for George Bush. It has often been suggested that when polled, 2/3 of the Perot voters said that they would have voted for Bush and the other 1/3 would have voted for Clinton.
That wasn't true based on the exit polls for 1992, which show they would've split evenly....so I'm not sure who is "often suggesting" it, but they aren't basing it off of any empirical evidence.
Also, don't forget that a lot of Perot's voters simply would've stayed home in 1992 if he hadn't run....and that they were pretty universally dissatisfied with the state of affairs in the nation, thus making them quite disinclined to vote to reelect the incumbent.
I think Perot did help Clinton, but no more than 1-2 percent nationally, and may have actually helped Bush in some areas, such as the Northeast (though Clinton won all of it anyway).