POLITICO's Dave Levinthal reports:

Although its been just hours since Newt Gingrich won the South Carolina primary, outside political groups have already flooded the next battleground state -- Florida -- with several million dollars worth of advertisements and phone messages.

The biggest bucks come from the pro-Mitt Romney super PAC Restore Our Future: Between Thursday and today, the organization has spent more than $2.07 million in Florida alone to fund broadcast advertisements and phone banking designed to both support Romney and attack both Gingrich and fellow GOP presidential candidate Rick Santorum, federal records indicate. Restore Our Future is run by former Romney staffers.

But as Romney heads to the Sunshine State, he'll run headlong into the buzzsaw that is a $1 million television ad campaign sponsored by the American Federation of State, County and Municipal Employees. The campaign is entitled "greed" and specifically targets Romney.

The pro-Santorum Red White and Blue Fund super PAC has also invested nearly $225,000 into Florida since early last week, with its independent expenditures coming in the form of mailers supporting Santorum and telephone calls panning Gingrich, according to federal filings.

Meanwhile, the pro-Gingrich super PAC Winning Our Future on Saturday purchased $100,000 worth of general Internet ads that promote the former House speaker and attack Romney.

But Winning Our Future, which is run by former Gingrich staffers and has spent about $3 million so far this election, has to date sunk most of its resources into the South Carolina primary and has yet to make a major play in Florida, which conducts its primary contest on Jan. 31.

Likewise, the pro-Ron Paul super PAC Endorse Liberty hasn't much involved itself in Florida, opting to funnel the $145,000 its spent since Thursday primarily into general Internet ads on Google, Facebook and StumbleUpon.com. This serves to reason, since Paul himself is focusing not on Florida, but caucus states such as Nevada and Maine where he believes he stands a better chance of winning.

Super PACs, which didn't exist prior to a pair of federal court decisions in 2010, are a specific brand of political action committee that may raise and spend unlimited sums of money to directly advocate for or against political candidates whenever they please -- so long as they don't directly coordinate with candidates' committees.

They may accept money from corporations, unions, special interests or individuals, too, and have spent well into the eight-figure range so far this election cycle.