"McCain would be the oldest president to begin a first term in office. By the end of a second term, Jan. 20, 2017, he would have a 24.44 percent chance of dying, compared with 5.76 percent for Obama, the firm estimates."
Like I was saying before, this is something to think about. Also, I don't think this study took into account just how difficult the presidency is on a person, so I figure it to be more than 24.44%.
In other good news, Intrade.com is showing Obama gaining the lead again- whew! Link.