You must think Romney ran against Obama in the primary to conclude that I think Romney ran against Obama in the primary.
Your illogic is showing. You’d better tuck it in.
One more time me asking question: "How did Romney get nominated?" Your Response: "I think many of us voted for Romney. The other choice was Obama."
If you are having trouble understanding your own non sequitur maybe you can find someone near you versed in Socratic logic and discourse to explain it to you. Unless you really do think you voted in a primary where Romney and Obama ran against each other then you need someone who understands how our election process works. Maybe there is a 9th grader near you who aced their Civics class that could help you.
Either way I wish you much luck on getting your confusion on the matter squared away, because it seems like you are going to need all you can get.