Pennsylvania has closed primaries. Voters registered with a particular party may only vote in that party's primary. On the voter registration form, select the box that says 'Change of Party.' You can change your political party at any time. When the change gets made in the system depends on when you make the change. Changes made more than 15 days before an election will take effect for that election. Changes made 15 days or less before an election will take effect for the next election. For the 2024 Presidential Primary, you must change your political party by 4/8/2024.