More info here:
From Supreme Court Justice Harry Blackmun’s papers, Justice Potter Stewart passed a note to Blackmun that read, “V.P. Agnew just resigned!!.” Since there was an important ballgame under the way and Justice Stewart was a Reds fan, the note included “Mets 2, Reds 0"
My father was a clerk for Justice Stewart at the time - he was the one who wrote this note, and it was recently discovered and now in the National Archives.