That's easy. There are many ways Democrat politicians will express their gratitude toward a constituent. For example, if you're New Mexico Governor Bill Richardson, and someone who "votes" for you is a known outlaw, you might grant him a pardon.
Congratulations are therefore tentatively in order for the individual pictured above, one William Bonney, aka Billy The Kid. Good for you, Billy. Glad you turned your life around.
And on the off chance somebody might take exception, bear in mind that we do have to make sure that everybody listed on the voter registration roles are legitimate voters, right? Felons are not allowed to vote, ya know.