I guess I have the same plan as I did with Dole vs. Clinton and McCain vs. Obama.
I voted for the most libertarian (small "L") candidate I could find and was proud of it. Too late to launch a 3rd-party candidate and too late to continue to put up with the machinations of the establishment Republicans.
Not too late to vote against both the current officeholder and the "loyal opposition" Republicans who created this conundrum.
If you live in a deep-blue state, e.g., CA, NY, then you can vote for who ever you please as it wont make a difference. But, you can still donate effectively as that method of support knows no bounds. On the other hand, if you live in a GW Bush 2004 state that went into the 0bama column in 2008, then you have the duty. 0bama must be defeated; take one for the team.