I'm going with the Buckley rule for this election, where my vote will go to the most conservative (from a constitutional standpoint, "social" conservatives don't fit this) ELECTABLE candidate. Regardless of their personal views, I firmly believe that any one of the GOP candidates would be a signficant net positive vs Obama, and if the senate changes over as well, could possibly roll back some of the damage. I think there are enough democrats and libertarian leaning GOP/tea party in the legislature to prevent any "too right wing" policies from being enacted, but without eliminating the Obama veto, any positive legislation is doomed.
Thus, regardless of who wins the GOP primary (I personally haven't decided yet) I WILL vote GOP, and I encourage others to do the same. Unfortunately, if we don't have an ideal candidate, given the limitations congress would put on wackiness, any of the current ones would be preferable to 4 more years of Obama, if only to:
1. "stop the bad stuff" from an executive branch over-reach and roll back agency/department rules and regs.
2. Not veto positive legislation that will happen anyway, that has zero chance with Obama at the helm
Actually, at this point I would even prefer the "bag of hammers" candidate (well, provided it has an auto pen) as I think (provided Reid was gone and we got even a simple majority in the senate, and HR.1 was "revert all agency rules to Jan 19,2009") just signing everything would be sufficient.
Unfortunately ANY 3rd party votes, or even non-votes in the upcoming election will help retain Obama.
While I can see the logic in makattak's point of just accelerating the result, i don't think all is lost...you have people more interested in policy and politics now more than ever before, as they have seen what can go wrong, and perhaps that is enough to make things start trending better. Basically, I have "hope" for "change"...in a good way, not the "change" I'll have left in my paycheck when BHO is done with it.