The five-day rolling average of polls from Feb. 24 to Feb. 28 shows Romney at 33 percent, followed by Rick Santorum at 25 percent, Newt Gingrich at 16 percent, and Ron Paul at 11 percent.

The situation didn’t look so bright for Romney as recently as a week ago, as Santorum shot to the top of the pack after a surprising three-state sweep in the Colorado, Minnesota and Missouri caucuses.

On Feb. 20, Santorum led Romney in the Gallup national poll 36 percent to 26 percent, and held a sizable lead in Michigan as well.

The two have been moving in opposite directions since then.

Santorum entered Tuesday’s primaries in Arizona and Michigan on the decline after getting hammered by Romney and Paul over his congressional record during a debate last week in Arizona, and then fell off-message by straying too deeply into social issues, where some of his views fall outside the mainstream.

Romney has led the Gallup national poll three times previously, only to be knocked off, twice by Gingrich and once by Santorum.

None of the candidates have been able to surpass the 37 percent mark nationally. Gingrich and Romney have each been there twice, while Santorum topped out last week at 36 percent.