D.C. Mun. Regs. tit. 3, § 1405
1405.1 A person who has been nominated as a candidate for Delegate or Alternate may withdraw the nomination by executing and filing with the Board a notarized affidavit stating that he or she irrevocably withdraws the candidacy for the office to which he or she has been nominated.
1405.2 In the event the affidavit is received less than forty-five (45) days before the next election, the name of that person may appear on the official ballot, or handout that is given to the voter with the ballot, notwithstanding withdrawal, if the Board determines that it is impracticable to exclude the person's name.
1405.3 In the event the affidavit is received more than forty-five (45) days before the election, and the nominee is part of a full slate, a replacement shall be selected in accordance with the rules of the political party, in order to maintain a full slate of delegates.
1405.4 Notice shall be given to the electorate in the affected precincts which informs voters of the withdrawal of the nomination for office by candidates whose names appear on the ballot or separate handout which is given to the voter with the ballot.
1405.5 The Board may remove from the ballot the name of any presidential candidate, and the names of the delegate candidates pledged in support of that candidate, who publicly withdraws as a candidate for president.
SOURCE: Final Rulemaking published at 27 D.C. Reg. 2763 (June 27, 1980), incorporating the text of Proposed Rulemaking published at 27 D.C. Reg. 1929, 1973 (May 9, 1980); as amended by Final Rulemaking published at 35 D.C. Reg. 2006, 2018 (March 11, 1988); and further amended by Final Rulemaking published at 43 D.C. Reg. 1350, 1353 (March 15, 1996).