It was George W. Bush, more than Ross Perot, who was responsible for Clinton's victory in 1992. It was Bob Dole, more than Ross Perot, who was responsible for Clinton's victory in 1996.
Once I knew that Bob Dole was the Republicans' nominee in 1996 I knew Clinton was going to win. If the Republicans hadn't staked so much political capital on that loser, I'm not sure his loss would have been a bad thing [the only reason Clinton was able to run roughshot during 1997-2000 was that the Republicans had lost their collective spine after backing loser Dole].