I thought he looked to frail before this incident.
And in 2 years there could be a really precipitous drop in activity level at his age. We've all seen it happen. You know an old person who is amazing and gets around so well. Before you know what happened, they're suddenly in a nursing home...or dead.
He's already old as fuck. If by some miracle, America wants to elect a socialist in 2020 he'll be even more old and brittle...then he has to make it another 4 years after that. Smart money wouldn't be on that happening.
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