Figures state (and take these with a pinch of salt as I have heard figures from 4% to 11% so am averaging) that - simply due to his age (72) - John McCain has around a 7% chance of dying during his first term and a 26% of dying in his second term (he would be 80 as his 2nd term closes).
Although this in itself doesn't sound particularly interesting, it does mean that in the (not unlikely) event of McCain's death - a right wing inexperienced fundamentalist Christian mother - who considers the war in Iraq to be a holy war, believes in creationism and that on death she is amongst those chosen by god and will ascend to heaven - would have her hand on the Nuclear button.
shudder