Michael Barone has an interesting theory about the Iowa results over at The Wall Stree Journal.

I so do not agree. What we have here is an electorate disgusted, at least in Iowa, with dynasties :

Ronald Wilson Reagan 1981–89
(George H. W. Bush)

George Herbert Walker Bush 1989–93
(J. Danforth Quayle)

Bill Clinton 1993–2001
(Albert Gore, Jr.)

George Walker Bush 2001–2008
(Dick Cheney)

That's in a nutshell Hillary Clinton's problem.