The Iowa caucuses, in my view, are all about one man. Ignore the Trumpster, albeit his fire will continue to roar for a while. He will burn out. Ignore the serious religious fundamentalism of Ted Cruz, who won Iowa. The only Republican who has a real chance of widespread appeal, aside from a very narrow base, is Marco Rubio, the second generation son of Cuban immigrants. He came a close third in a seriously rural mid west state where he has limited appeal. His star is on the ascendancy.
As for Clinton she should see off Bernie Sanders, who is pursuing the Jeremy Corbyn approach.
Dan Hodges always writes well and his take on the American election is here: