(CNN) – A new national poll released Monday shows Newt Gingrich has essentially lost his lead over Mitt Romney during the last few days.
According to Gallup's daily tracking poll, the former House speaker now has a 28%-27% edge over his chief GOP presidential opponent among registered Republicans nationwide.
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The one-point margin, which falls well within the poll's sampling error, represents a far slimmer margin than the eight-point advantage Gingrich held over Romney on Friday.
Gingrich had jumped ahead of the former Massachusetts governor in the national poll shortly after Gingrich's South Carolina primary victory on Jan. 21.
But the new poll indicates Gingrich is on the decline, as Romney has regained momentum.
Monday's results show Gingrich fell four points to 28%, down from 32% on Friday. Romney, meanwhile, rose three points to 27%, up from 24% during the same time period.
The latest survey was conducted Wednesday through Sunday, a five-day window that included a heated televised debate and fiery attacks between the two candidates on the campaign trail.
Romney's campaign, especially, has gone on the offense, targeting Gingrich for his 1997 ethics reprimand in Congress and his consulting work with mortgage giant Freddie Mac.
The former governor's attacks have been coupled by efforts from the pro-Romney super PAC, Restore Our Future, which has flooded Florida airwaves with millions in ad spending.
The poll also indicates Rick Santorum made gains over the weekend. The former Pennsylvania senator, who's no longer campaigning in Florida and has moved on to other early contest states, moved up three points from 13% on Friday to 16% on Monday.
Also bypassing Florida, Texas Rep. Ron Paul –who was in Maine on Saturday– remained steady in the poll at 13% in the last few days.
For the ongoing poll, Gallup surveys more than 1,000 Republican registered voters on a daily basis, and the poll drops the oldest of five days each day and adds results from the most recent day of polling.
Gallup surveyed 1,121 Republicans and Republican-leaning independents by telephone Jan. 25-29, with a sampling error of plus or minus three percentage points.
– CNN Political Editor Paul Steinhauser contributed to this report.