IDIOMS

caucus race

(US, idiomatic) A political competition; the game of campaigning and one-upmanship to get votes and be elected.

Example: 1993 October 16, "Solomon Drops Out of Race To Be G.O.P. House Leader", New York Times:
  Mr. Gingrich, who is now the minority whip, announced last week that he had rounded up more than 100 commitments from House Republicans for the caucus race to come after the election next year.
1993, M. Barone, G. Ujifusa, R. E. Cohen, The Almanac of American Politics 1994, National Journal, page 176:
  […] she was backing southern moderate John Spratt in his strong but unsuccessful caucus race for Budget Committee chairman.