Party politics has nothing to do with this race. If you don’t pick the least harmful candidate then your non-vote or vote for a third party effectively supports an Obama. Voting for a third party that has no chance at all has the same effect. Obama will be far worse than McCain and I despise McCain. Hope you can live with the consequences of directly or indirectly electing a true declared socialist from the party traitors.
The LEAST harmful candidate would be Ron Paul. Next Bob Barr. And that is just those who are in one of the 3-4 largest Parties.
McCain won't garner a majority of the Electoral College. The Dems voting for him now will cross back into their camp. It'll be Dole/Kemp all over again.