Delaware constitution
Article V
Section 4a

The General Assembly shall enact general laws providing that any qualified elector of this State, duly registered, who shall be unable to appear to cast his or her ballot at any general election at the regular polling place of the election district in which he or she is registered, either because of being in the public service of the United States or of this State, or his or her spouse or dependents when residing with or accompanying him or her because of the nature of his or her business or occupation, because of his or her sickness or physical disability, because of his or her absence from the district while on vacation, or because of the tenets or teachings of his or her religion, may cast a ballot at such general election to be counted in such election district.