Could The Great Palin Become President

What are the statistical chances that The Great Palin could become president if John McCain is elected? Read about it:

• MSNBC, 1 in 4 chance McCain may not survive 2nd term
• Politico, McCain and the politics of mortality
• Askville by Amazon, "Given his age and using actuarial data, how likely is it that John McCain would die in office, or even pre-election?"
• PR-insider.com, Death Odds Haunt McCain's VP Pick // High Chance She Will Become President From His Death or Disability