In their 70s, are Joe Biden and Bernie Sanders healthy enough to be president?

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Former Vice President Joe Biden speaking at the Presidential Gun Sense Forum in Des Moines, Iowa. Credit: Gage Skidmore.

The two men leading the race to become the Democratic presidential nominee are -- let’s face it -- old. Bernie Sanders is 78. Joe Biden is 77. If elected, either of them would be the oldest president to take office. We talk about their health and whether we need to know more. Neither Biden nor Sanders has released his full record -- despite promising to do so.