One of the more amusing episodes from over the holidays was Joe Biden initially saying he wouldn’t comply with a Senate subpoena to appear at the impeachment trial. This was foolish for two reasons: 1) Trump, as you might have noticed, got impeached, in part, for defying congressional subpoenas; 2) There’s no way the Senate is going to subpoena Biden, so even if he rejects the idea of appearing, there’s zero upside to staking out that position.