It’s not a slippery slope. McCain is 72 and you have to be realistic about someone that age. And surely the McCain’s longevity is not improved by his history of four malignant melanomas. Dementia can be argued but I digress. You can say that he has his mothers gene who is in her 90’s now, but then again you can say that he has his fathers genes who died @ 70. In the end the next person in line is Palin, that is if the Reps win the presidency. You can continue rants about who is next in line, like we wouldn’t know, but how many speakers of the house have become Commanders in Chief due to death of the Pres and VP?