Can Republicans give a substantive answer on how McCain is different from Bush?

I mean, i personally believe they were siamese twins separated at birth; i could go on to point how similar they are, but that's not all that hard to do. Since i'm having a hard time differentiating between the two can you explain to me how a McCain administration, would be different enough from a Bush one to put the country back on the right track; have fun trying to convolute McCain's voting record to make your point, that is, if you can