Rick Santorum has clawed back to within striking distance of Mitt Romney nationally, according to Gallup’s latest five-day rolling average.

Romney leads with 32 percent, followed by Rick Santorum at 27 percent, Newt Gingrich at 17 percent and Ron Paul at 12 percent.

Just over a week ago, Romney became the first candidate to surpass the 37 percent mark in the Gallup national poll, as he opened up a 16-point lead over the rest of the field. That lead has essentially evaporated, and it’s not just Santorum making gains — as the Republican primary swings through the southern states, Gingrich has also seen his fortunes improve, picking up 5 percent over the last week.