This section does not apply if only one Governor and Lieutenant Governor unit files a certificate of candidacy for the nomination of a political party for those offices in a primary election. If a candidate for Governor dies, withdraws the candidacy, or becomes disqualified for any reason after the deadline for filing a certificate of candidacy for a primary election under § 5–303 of this title, the remaining candidate for Lieutenant Governor of that unit may: designate the Lieutenant Governor candidate as the successor candidate for Governor and appoint a successor candidate for Lieutenant Governor; or designate a successor candidate for Governor. The names of any Governor and Lieutenant Governor candidate unit that is designated under paragraph (1) of this subsection shall be listed jointly on the primary election ballot. The successor candidate for Governor designated by the Lieutenant Governor candidate under subsection (b)(1)(ii) of this section, or the former candidate for Lieutenant Governor who subsequently is designated as the candidate for Governor together with the candidate appointed as the successor candidate for Lieutenant Governor under subsection (b)(1)(i) of this section, each shall file a certificate of candidacy with the State Board. The certificate of candidacy shall be filed: by the fifth day following the withdrawal deadline specified under § 5–502 of this title, if the former candidate for Governor files a certificate of withdrawal; or by the fifth day following the day of the death or disqualification of the former candidate for Governor, if that former candidate dies or is disqualified less than 70 days before the day of the primary election. A certificate of candidacy may not be filed under paragraph (2)(ii) of this subsection less than 65 days before the day of the primary election. If the death or disqualification of a former candidate for Governor occurs less than 65 days before the day of the primary election, the existing Governor and Lieutenant Governor unit whose filing is complete: shall remain on the ballot; and if nominated, a vacancy in the office of Governor shall be declared and filled under § 5–1005 of this title as if the death or disqualification had occurred after the primary election.