Presidential nominating conventions have not required more than one ballot to choose the party's official nominee since 1952, largely due to the
A) rule change that a candidate need only win a plurality of votes at the convention rather than a majority to gain the nomination.
B) changes in party rules requiring a nomination on the first ballot.
C) end of the boss-dominated caucus system.
D) role of television, and the desire of both parties to unite behind one candidate in advance in order to present a show of harmony, rather than bickering, to those who tune in.
E) changes in federal law requiring parties to have their nominations virtually assured before the conventions begin.
Answer: D