Dec 9 Local News Party Affiliation Must Be Changed This Year To Vote In 2011 Primary Kentucky is a closed primary state, which means voters cannot cross party lines to vote for a candidate outside their party. The primary is May 17th, but if voters want to change their affiliation before the primary, they must do so by December 31st. By Tony McVeigh Dec 9 Local News Party Affiliation Must Be Changed This Year To Vote In 2011 Primary Tony McVeigh