So if I were Trump I would not be sweating it at all, I would still keep the energy up at a high level and encourage the voters to show up, but Cruz winning Iowa is not a lasting victory by any means, and the future looks bright for Trump taking the nomination.
Again Trump's campaign is focused on winning the candidacy, not putting all of his eggs in one basket (Iowa) like Cruz and Rubio did. I think Rubio will go down in the polls when Florida (his home state) votes strongly for Trump and that will be quite embarrassing for his campaign.
I think Ted Cruz will go down in the polls after the New Hampshire primary, with a gain of momentum following S. Carolina, but losing that gain after the Nevada primary. Trump will have strong numbers in all of those states. VIA You Tube