Simcox isn't quite a joke candidate, he does have an outside shot. I find his website interesting visually, since he didn't hire the traditional DC people for it and I spend a lot of time working with campaign websites.
http://www.simcoxforsenate.com/index.php?p=youtubeHe's not a crazy demagogue, speaks of middle-class values, and is speaking in a fairly nuanced, articulate way. Even when asked how he'll win the general election, he realistically points out that the Democrats aren't going to run anyone serious against John McCain. He claims it's not a single-issue campaign, but I assume it'll just be immigration and TARP. He'll have a lot of money from his contacts nationwide, but McCain has a lot more of them.