I have been told that individual states have law prescribing that electors must vote on first ballot at the convention as they are pledged.
Federal law does not.
I think your talking about the General electoral convention on the 15h of December(the only real Federal election that ever takes place), not the party convention which happens at various times depending upon the State and party.
I think your talking about the General electoral convention on the 15h of December(the only real Federal election that ever takes place), not the party convention which happens at various times depending upon the State and party.