Just a week ago, Mitt Romney's lead over Newt Gingrich was 23 points. And now in the wake of the stunning South Carolina Newtmentum result (Romney didn't drop, but Newt surged), Gallup's Sunday national poll tracker puts Romney at 30 and Gingrich at 25.
Just as in South Carolina, this represents less of a drop for Romney than a surge for Newt. Expectations were that Gingrich would catch and perhaps surpass Romney between now and the Florida primary on Jan. 31. And while Florida may be seeing a ton of advertising this week (much of it negative), the national numbers will reflect the overall gestalt.
However, and for example, note this from Huffington Post's pollster.com:
Although he appears headed to victory in Saturday's South Carolina primary, Newt Gingrich faces skepticism from grassroots Republican activists and officeholders, who increasingly prefer Mitt Romney as their first choice for the Republican presidential nomination. That's the main finding from the latest Power Outsiders survey in the early primary and caucus states and beyond.
When people talk about momentum (Gallup graph) versus organization (HuffPost article), that's what they mean.