Section 2-122. National party conventions; delegates, election

Delegates
  and alternates to a national convention of a party shall be elected from
  congressional districts, or partly from the state at  large  and  partly
  from  congressional  districts,  as the rules of the state committee may
  provide. Such delegates and alternates from the state at large shall  be
  elected by the state committee or by a state convention of the party, as
  the  rules  of  the  state  committee shall prescribe. If the rules of a
  national party provide for  equal  representation  of  the  sexes  among
  delegates  elected  from  districts,  such  district  delegates shall be
  elected separately  by  sex.    District  delegates  and  alternates  to
  national  party  conventions  and  delegates, and alternates, if any, to
  such a state convention shall be elected at a primary. All delegates and
  alternates to a national party convention shall be enrolled  members  of
  such  party. When any such rule provides for equal representation of the
  sexes,  the  designating  petitions  and  primary  ballots  shall   list
  candidates for such party positions separately by sex.