From a Michael Schaffer Capital City column on politico.com headlined “Voters Are Worried About Chuck Grassley’s Age, and That’s a Good Thing”:

Chuck Grassley wants everyone to know that he might well be the fittest 89-year-old in the entire state of Iowa. Running hard to retain the seat he first won in 1980, he’s tweeted out video of his early-morning runs, done push-ups at public campaign events, and cut an ad touting his vitality. For a guy who would be 95 by the time his term ends, it seems like a smart move, short-circuiting concerns about whether he’s up to the job.