This is what an 8-point difference between Obama and Gingrich would look like in 2012:
Obama 53%
Gingrich 45%
third parties 2% altogether
Obama 382 EV
Gingrich 156 EV(Shades represent gaps in voting and not raw amounts -- 20% color for less than a 5% margin, 40% color for a margin over 5% but less than 10%, and 70% color for a margin greater than 10%). Arizona goes into play solely because it has nobody running from the state this time.
This assumes that statewide polarization is roughly as it was in 2008 (no reversion to the mean which would make things look less severe in the shading but turn more states over to President Obama.