technically speaking, another’s vote is none of yours or mine business. I can wield a pencil however.
Of course it is. If other peoples' votes weren't our business, nobody would campaign or try to convince people how to vote. And if you're going to say that it would be much better for conservatism if Obama won, then it is perfectly legitimate for others to point out that the logical conclusion of your position is for conservatives to vote for Obama, thereby advancing the cause of conservatism.
If you don't have a rebuttal to that argument, I'd suggest you check your premises.