A clown show? I don't see the Democratic debates as a "clown show". There are now only 2 candidates, with pretty distinct personalities, backgrounds & policy positions.
The Republican situation is completely different. The GOP has torn itself apart in the last couple of decades with the growth of the Tea Party, Christian conservatives, right-wing talk-shows & blogging, all disrupting the traditional GOP establishment. This has created the rise (& fall) of such figures as Michele Bachmann, Sarah Palin, Herman Cain, Rick Santorum, Ben Carson, Carly Fiorina & many others. Into this already volatile mix has stepped the incomparable Donald - a celebrity/businessman/reality TV personality - with an ego the size of ... well ... Trump. With so many candidates jostling for attention, the possibility of putting forward any kind of coherent policy statement, assuming that some of the candidates actually had coherent policy ideas to offer, has been lost in the barrage of personal attacks & strategic maneuvering. It will be interesting to see what effect the NH primaries will have on thinning out the herd.