I am sorry, but people like this undermine the whole system of democracy and make a mockery of it. It is not about throwing your teddy out because your candidate isn't on the final ticket. It is about choosing the right person to lead your country. It has been a long time since there have actually been distinctly different policies and a choice to vote on. People need to take advantage of this and educate themselves about what the options are and the consequences of one over the other.
When someone says "on principle I will not do...... or will do...." it normally means they have thrown away logic and excuse their actions as a matter of principle! Are there going to be Republicans now voting for Obama "with a sad heart" because he has chosen Palin as his running mate? That would be equally illogical and stupid.