To beat Mr McCain in November, Mr Obama must persuade Americans that youth and intelligence trump age and experience.
要在11月击败麦凯恩，奥巴马必须说服美国人，青春和才智胜过年岁和经验。
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Martin, who had 17 children and returned to work at the age of 99 saying he was bored after two years of retirement, would beat the previous record for world's oldest marathon runner by eight years.
He beat his own world record by covering an area of 330 square metres with a wintry scene to coincide with the DVD launch of Ice Age 3: Dawn of the Dinosaurs.