Hello... Senility in office!!!
Plus... The guy has had three major bouts with skin cancer and a great medical probability that he'll have more.
McCain's Dad DIED at 70... might want to look into that. John Sidney McCain, Jr. (January 17, 1911–March 22, 1981). McCain would be mid 72 before he even got to the Oval Office... and that's just entering into this very stressful job let alone completing anything competently.
Mom's not running for President of The United states of America... and I'd like someone that the bar isn't set at "lucid" if you don't mind. Kinda might need someone on the top of their game not on their way out.
Jack Nicklaus (68 year old home town hero here in Columbus, Ohio) is one of the best golfers ever. He was smart enough to just walk away years ago from trying to compete with the current top players.
Actually except for the fact Jack Nicklaus isn't known for pandering and Flip Floppin' all over the place it's a great comparison Jack Nicklaus v. Tiger Woods.
I'm thinking Tiger's gonna win that tournament! 
http://www.youtube.com/watch?v=2UxCWmxdZg0
http://www.youtube.com/watch?v=BQKPWdUF7yk