Though giving up half its delegates to do be, FL is "winner take all" so a win for Romney reestablishes his momentum going into a certain win in Mormon-heavy Nevada caucus.
It's likely the Maine, Colorado caucuses will be Romney territory as well; the Missouri primary doesn't determine their delegates (that's done in a March caucus) to it's technically irrelevant.
Michigan is Romney's birth state and his dad was governor; he'll win easily--Santorum's focus on manufacturing won't help there. As a result of the calendar, after FL, AZ is the next "obvious" competitive state and it's vote is more than a month from now, just before Super Tuesday.
Santorum can wait around like a vulture hoping to see Newt stumble, siphoning off delegates and helping Romney or exit ahead of FL and maybe help prevent Romney from that big prize which restores his momentum and the story of inevitability.
This week is a time for choosing for the Senator. Is he a willing tool of the establishment (like in Thune vs. Spector) or does he care more about his issues?
If the race was just Newt vs. Santorum, I'd be all for it but that isn't happening. Santorum's persistence can only assist Romney's rebound. If Santorum really truly believes Newt is that unstable, too great a risk, that Newt will eventually flame out, Rick should drop and endorse Romney.
For all the floral thinking going on around here and there, that reeks with squish for Rick Bachmann to stay in the race, there are those propping him up to slow Newt and his MOMENTUM.
Rick played with the players in DC, did what needed to be done when told, to Toomey, and endorsed Specter who was the final vote for Obamacare.
His only significant financial support at this point is from the RINO machine, cash enough to bag him up and send him into Florida to assist in the kitchen sink approach they have in mind for Newt. Maybe shaves off a few points and gives Romney some time to reboot.