Republican puppies for sale!

 A fellow is selling puppies at a flea market. His sign says, "Republican Puppies, $50." A week later, the same man is selling the same puppies at the same flea market, but the sign says "Democratic Puppies, $50." A possible customer asks, "What's up? Last week they were Republican puppies and this week they are Democratic puppies?" The seller replies, "This week their eyes are open."