Sec. 6. The county chairman:
(1) of the county in which the greatest percentage of the population of the election district is located; and
(2) of the same political party that elected or selected the official who vacated the office to be filled;
(or an individual designated by the county chairman) is the chairman of a caucus held under this chapter. The chairman is not eligible to vote in the caucus unless the chairman is also a member of the caucus.