Agree. Totally implausible that he wouldn't remember his marathon PR.
I discussed this with my colleague, also a running geek, and these are the possible explanations we came up with:
--He considers his PR slow and doesn't want to reveal it.
--He didn't want to look like a running geek obsessed with his PR. (Runners understand that of course you know your PRs, but non-runners listening to the interview might not. He might be playing to that audience.)
--There's something about the marathon he ran that makes him reluctant to give details about it and/or to consider his PR legit, like the course was later revealed to be short.
--He actually never broke three but he really, really wanted to, and he couldn't resist the urge to pad his time, figuring, "If I say it was two fifty something and imply I don't remember, I'll have an out if someone accuses me of outright lying. I can say I didn't remember."
Yes, we actually spent time weighing these scenarios.
For what it's worth, I'm generally a split-ticket voter and don't really have a dog in this fight.