Mitt Romney won in New Hampshire on Tuesday, and his supporters are now moving in for the kill.

The super PAC supporting Romney’s campaign has increased its ad buy in Florida by $3.6 million — a huge number that comes on top of the $2.3 million in ads the super PAC, Restore Our Future, bought in South Carolina on Monday. A super PAC source confirmed the numbers to The Fix.

South Carolina holds the next primary on Jan. 21, and Florida’s will be held Jan. 31. Romney so far is the only candidate to benefit from huge ad buys in those two states.

It’s becoming more and more clear that Romney’s opponents and their super PACs can’t compete financially with his campaign and his super PAC.

He will have far more of an advertising edge in South Carolina and Florida than he’s had so far — notwithstanding the pro-Newt Gingrich super PAC that just got a $5 million infusion from casino mogul Sheldon Adelson.

The big buys in South Carolina and Florida betray an emerging effort from Romney’s campaign and supporters to effectively end the GOP contest by the end of the month. They also serve as warnings for Romney’s opponents of what they will be up against if they stay in the race.

If Romney can win both of the next two states, he will almost surely win the Nevada caucuses on Feb. 4, and there are no other major contests until late February — a daunting period of time for any of his opponents to sustain a campaign.