Gingrich has slipped significantly in NH as well. Of course Romney is also down thanks to Huntsman and Paul - and Newt never was ahead of Mitt, so that state is a bit of an anomaly.
Again, Gingrich never had any delusions about NH. He barely campaigned there. NH has 12 delegates. SC & FL have 75.
Next up after that are four more caucuses before Michigan, a month later and one of five(!) "home" states for Romney.