How the Justices Vote:
In Presidential primaries and elections, that is, not in cases.

  I personally find the second Justice Harlan's approach the most commendable. Justice Harlan refused to vote in Presidential elections to make it harder to mentally pick sides as to which Presidents he favored and which he did not. I'm probably in the minority in applauding this, but I think it sends just the right signal about how Supreme Court Justices should approach the other branches.