Puzzled Over the Primary Results for South Carolina

There's something I don't understand in the primary results for South Carolina. If Fred Thompson and Dennis Kucinich have dropped out of the presidential race:

1) Why were their names still on the ballot?

And/Or

2) Why did SC people still vote for them? Thompson got a whopping 69,000+ votes while Kucinich had about 500+. In fact, Thompson got more votes than Romney, Paul, and Giuliani.

SC voting results from CNN:

Democrats
Obama: 295,091 votes 55%
Clinton: 141,128 votes 27%
Edwards: 93,552 votes 18%
Kucinich: 551 votes 0%


Republicans
McCain: 147,283 votes 33%
Huckabee: 132,440 votes 30%
Thompson: 69,467 votes 16%
Romney: 67,132 votes 15%
Paul: 16,054 votes 4%
Giuliani: 9,494 votes 2%
Hunter: 1,048 votes 0%



P.S. I have no idea about the mechanics of voting: whether voters just tick off the ballots or write their candidate's name.