When members of the Democrat Party voter base vote 3rd party, they are not voting to prevent Romney from being elected. It translates into their voting for Romney.
No, it is not a direct vote. It is an indirect vote.
If they vote for Obama, it cancels out a vote for Romney.
If they write in Hillary Clinton, then their vote does not cancel out a vote for Romney, and Romney gains against Obama.
In the same way, if you vote 3rd party, then the Romney vote you would have cast that cancels out a Dem Obama vote, no longer cancels that vote.
In the end, Obama racks up more votes and wins.
If Obama wins, and you helped cause that win, then you “voted for Obama”.
Now you can argue the specifics all day that technically you did not cast a ballot vote for Obama, and you would be technically correct. You did not actually vote to put him over the top.
But every 3rd party vote like yours that does not go to Romney, reduces his vote tally in your state, making it easier for the people voting for Obama to give him the win.
If Obama wins, he wins. It really doesn’t matter if you cast an actual vote or just a virtual vote by withholding your vote from his opponent. He still wins. You still helped him win.
Now in your case, you are perfectly fine with an Obama win. As you stated, your only concern is that should he win, he wins by the slimmest margin.
And what does that achieve?
When Obama passes an Executive Order requiring all cars to be electric powered, then how does your slim margin matter? You still have Obama in dictatorial power.
We will not be able to repeal Obamacare if he wins, even by a single slim vote. Repealing Obamacare matters to me. Maybe not so much to you.
You are assuming that Romney would be better than Obama. I reject that assumption having become familiar with Romney's record and projecting ahead into the probable consequences of a Romney win. They are equally dangerous for America, and it is blind fear that immediately screams back, "No they're not!!!!!" Yes, in their own ways, they are, and Romney's record DEMONSTRATES IT.
An angry person is going to blame others when things don't go their way, just as if Romney loses, you will blame those of us who refused to vote for him and went third party instead. That is anger, not logic, talking. That is stomping your foot and saying, "But Romney WAS ENTITLED to your vote!!!"
And that is your mistake. There is no voting "against," and there is no "indirect vote." They are both illusions.