There are really three areas that gave the GOP trouble in 2012 that cost them the election:
I. The Southeast Atlantic Coast(Florida to Virginia)
II. The West(NM, CO, and NV; to a lesser extent OR)
III. The Rust Belt(PA, OH, WI, MI/MN to a lesser extent)
A Hispanic-centered strategy (pro-immigration reform/pathway to citizenship) would help most in region II and work decently in region I(especially in Florida, not so much in Virginia and the Carolinas).
A socially moderate strategy (moderate on abortion; support gay marriage and embryonic stem cell research) would play well in parts of II, especially Colorado, as well as parts of I in Florida, Virginia, and North Carolina(NoVa, S Florida, Research triangle).
Then, there's the populist strategy - ditch the anti-auto bailout stuff, moderate the economic message. This could have a significant impact in III, which has the most electoral vote rich swing region(when counting only states that have a reasonable chance of flipping.
Which strategy would do the best to deliver electoral votes back to the GOP? Obviously doing all 3 would have the most effect, but most hard-core conservatives would have a hard enough time stomaching 1 of 3, let alone all 3. So, the idea is to find the best strategy for gaining electoral votes with the least amount of ideological compromise.
I would guess they would probably pick option 3 -it is the path of least resistance, and the least likely to cause them problems with their existing base.