Don't Call it a Comeback, I Been Here for Years!

Ladies and gentlemen, we officially have ourselves a race!  What seemed like a foregone conclusion for Mitt Romney only a few days ago has now turned into an open 3-man contest with Rick Santorum winning Iowa, Romney winning New Hampshire and now Gingrich winning South Carolina.  And not only did Gingrich win South Carolina, but he won it walking away; he beat Romney by 13 points (over 75,000 votes).

Results for South Carolina Republican Primary (U.S. Presidential Primary)

Jan 21, 2012 (100% of precincts reporting)

1. Newt Gingrich	243,153	40.4%
2. Mitt Romney	167,279	27.8%
3. Rick Santorum	102,055	17%
4. Ron Paul	77,993	13%
5. Rick Perry	2,494	0.4%
Other	8,192	1.4%

Questions:
What does it mean that Gingrich won by double digits?
Does this give Gingrich the momentum to carry Florida?
Did the debates give Gingrich his boost?
Is this a testament to the "Southern Strategy?"