In Delaware, you can pick a political party affiliation when you register. If you do not pick a political party, you will be registered as: No Party. You must register as a Democrat or Republican to vote in a primary. Democrats vote for Democrats and Republicans for Republicans. You can register to vote or update your record using Delaware's Online Registration System. You can change your political party affiliation up until 4/2/24 (the 59th day before the Presidential Primary).