Yes you are - by cowardly proxy...
You are free to say that, and I am free to think you a horrible, terrible person for endorsing more socialists in our society and governance.
Further, your argument boils down to an admission that my votes are worthless unless I spend them on "a major candidate", and if that be the case then it follows that there cannot ever be any meaningful reform for the two parties because no candidate not of them can win, thus ensuring that the current choices are all that will remain: Democrats, who are honest in their goals, but whose goals are distasteful; and Republicans, who have good sounding goals but do not act towards them.
I'm through voting "against" someone, I'm only voting to vote "for" someone, and I am not for Romney. If you don't like it, tough; at least my conscience will not condemn me.