Work to deny him (Romney) a second term - WITH WHOM? Party candidates normally do not run against their own incumbent. And, if you think it’ll go “all primary” on an incumbent Romney, I’ve got some beach land to sell you in Nebraska. That will not happen.
It would have to start now ... not in early 2016. A message would have to be sent to Mittens ... loud and clear ... that we will not stand for any further left leanings from him. And if he does, we will have a conservative candidate waiting and ready to challenge him. This could be accomplished by more involvement from the tea party folks, calls to representatives/senators, etc ... the avenues to keep Mittens in check.
IMO, that would be a lot easier than recovering from 4 more years of the Kenyan.