unit rule

a rule, as in national political conventions, that the entire vote of a delegation, if the state's party apparatus so chooses, shall be cast as a unit, disregarding minority votes in the delegation

See unit rule in American Heritage Dictionary 4

noun
A rule of procedure at a national politcal convention under which a state's entire vote must be cast for the candidate preferred by a majority of the state's delegates.
link/cite print suggestion box