Reply #6: In my state (Georgia) there is no party registration.

[MGKrebs]

However, in primary elections, you must select which ballot you would like. In other words, you can't vote in both the Republican and the Democratic primary. They do track which ballot you selct, and therefore if you vote in the primary, the voter roll will show which ballot you chose, and that voter roll is public information. That is as close as we come to party affiliation here, except that if you get elected to be a member of the state Democratic party, you have to take an oath to uphold party principles, etc.