If there is a roll call vote for president at the national convention of a political party, all delegates and alternate delegates whose selection is subject by party rule to the approval of a presidential candidate shall vote on the first such roll call for that presidential candidate unless released by such candidate.
Mass. Gen. Laws ch. 53, § 70I
Delegates and alternate delegates to national conventions; voting for president on first roll call
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.