firehouse primary
n.— «Chichester announced earlier this spring that he will retire at the end of this term. That sparked an intra-party battle over the nomination method, with one faction favoring an open primary and the other pushing for a Republicans-only method. The result is what’s known as a firehouse primary, which is run by the party, with limited polling places, and open only to Republicans. Voters on Saturday will have to sign an oath vowing to support the Republican nominee in the general election in November.» —“4 GOP Senate hopefuls in forum” by Chelyen Davis Free Lance-Star (Fredericksburg, Virginia) May 14, 2007. (source: Double-Tongued Dictionary)