If you need to register to vote for the first time in Kentucky or make an update to your registered name or address, you'll have to do so by closing time at the County Clerk's office on Monday, April 21st, in order to be eligible to vote in the democratic primaries on May 20th. Registered voters need to be sure that the name and address on their voter registration card matches the name and address on their ID. If there is a discrepancy, they will not be eligible to vote.