Alvin Greene

I've been following this story of Alvin Greene. He won the South Carolina Democratic primary. Here's a guy who didn't campaign, didn't spend any money, nobody knew anything about him, yet he won.
This is the strangest think I ever heard. Why vote for a guy that nobody ever heard about. You would think that the other candidates campaigned and got their message out. Even if you didn't like them, you knew what they stood for.
I was watching TV and somebody said that Mr. Greene was a plant by the Republican Party. This has to be the dumbest thing I ever herd. If they were going to plant somebody, they would have some money behind him to sabotage the primary. Was it the Republican's idea to have somebody run, not spend any money on him and hope that people were stupid enough to vote for him?