We're arguing semantics here, but you struck on some common ground.
They don't always vote....you and me, we always vote.
Sometimes they sit on the couch. 40% of eligible voters sit on the couch in every election. To the politically ignorant, one party is the same as the other...so registration will likely be whatever their parents were registered as. It means nothing to me because it means nothing to them.
It's a vast pool of uninterested voters. Sometimes something catches their fancy and gets them off the couch.
It bothers me when it's lies that's getting them off the couch.