Buzzfeed has some interesting projections of how the election would have gone if only white men, only men, only whites, and only over 24 year olds had had the vote. What they have done is chosen the voting rules for the years 1850, 1870, 1920 and 1970 and using the 2012 electoral map, worked out who would have won each state. The map below is the one using the 1850 rules. 

I was pointed to this site by Graham Harman (and I’ve clarified the post above following a message from Graham – my original wording was indeed confusing).