Section 6-116. Party nominations; election to fill a vacancy

A party
  nomination of a candidate for election to fill a vacancy in an  elective
  office  required  to  be  filled at the next general election, occurring
  after seven  days  before  the  last  day  for  circulating  designating
  petitions  or after the holding of the meeting or convention to nominate
  or designate candidates for such, shall be made, after the  day  of  the
  primary  election, by a majority vote of a quorum of the state committee
  if the vacancy occurs in an office to be filled by  all  voters  of  the
  state,  and otherwise by a majority vote of a quorum of the members of a
  county committee or committees last elected in the political subdivision
  in which such vacancy is to be filled, or by a majority  of  such  other
  committee  as  the  rules  of  the  party  may provide. A certificate of
  nomination shall be filed as provided for herein.