You must be registered as a Democrat or a Republican in your party’s Presidential Primary. The deadline to change political party affiliation before the 2020 Presidential Primary is Friday, February 28, 2020.
he deadline for a person to change party aﬃliation before Delaware’s 2018 Primary Election is Friday, May 25, 2018. Delaware is a closed primary state. You must register in the party in which you want to vote in a Primary Election – Democrat or Republican. Delaware does not permit persons registered as unaffiliated or with another party to vote in a Primary Election.