11 CFR § 9032.7 - Primary election.
(a) Primary election means an election held by a State or a political party, including a run-off election, or a nominating convention or a caucus -
(1) For the selection of delegates to a national nominating convention of a political party;
(2) For the expression of a preference for the nomination of Presidential candidates;
(3) For the purposes stated in both paragraphs (a) (1) and (2) of this section; or
(4) To nominate a Presidential candidate.