Mike Huckabee was able to overcome the millions spent by Romney attempting to smear him and emerge from Iowa with a decisive win. Huckabee is now a force that no one can dismiss. The attacks and scrutiny against him will continue, but he was able to overcome them in Iowa, so he should be able to so again.
The next step for Huckabee is to use this momentum to increase his funds and to start campaigning aggressively in the upcoming states. He has a shot at second in New Hampshire (although third seems more like right now) and he could pull an upset in Michigan and finish first. He needs to make solid showings in those two states in order keep momentum rolling into South Carolina and Florida.
These next few weeks will be interesting.