WI: Donald Rumsfeld Running For President in 1976 or After

Let's say that in ATL 1976 or any election after, OTL's frontrunners do not run, but Donald Rumsfeld runs and wins the nomination instead. I know he probably wouldn't win in 1976, but what would be the best year for him to run in ATL?
 
I could definitely see it in 88 if Reagan taps Rummy for the 80 VP slot. Maybe if Bush pushes harder against Reagan's policies and refuses the spot when offered?
 
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