In the Entries page you can mark an entry as a featured by clicking on the star icon. This option is very helpful to better manage and identify entries.
In the Entries page you can also filter the entries using multiple conditions and mark those entries with a star manually or in bulk using the Bulk Actions.
Now its available a new option (Only include Entries marked with a star) in the Pick Winners tool that allows you to include only the entries that have previously marked with a star.
This will allow you to include or exclude only specific entries from the Pick Winners tool depending on the type of your campaign.