Del. Code Ann. tit. 15, § 4326
(b) The position of an elector not present to vote is vacant. The Secretary of State shall appoint an individual as a substitute elector to fill a vacancy as follows:
(c) To qualify as a substitute elector under subsection (b) of this section, an individual who has not executed the pledge required under § 4324 of this title shall execute the following pledge:
“I agree to serve and to mark my ballots for President and Vice President consistent with the pledge of the individual to whose elector position I have succeeded.”