Quote, please.
Meanwhile:
"However, even if such promises of candidates for the electoral college are legally unenforceable because violative of an assumed constitutional freedom of the elector under the Constitution, Art. II, 1, to vote as he may choose in the electoral college, it would not follow that the requirement of a pledge in the primary is unconstitutional."
I think that's just what I was saying. It is constitutional to require the pledge, but probably not constitutional to punish those who violate the pledge.