Forum: a meeting or medium where ideas and views on a particular issue can be exchanged.Almost every other country that has legalized gay marriage has done so on a federal level.
In the US, we often have voted to legalize it at a state level, but then judges ban it again.
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This isn't in debates, though, so it was kind of unnecessary imo. And if that is the only reason you're in favor of gay marriage then I'd hate to say it but you really aren't.
You are using a forum. The whole point in a forum is for ideas and views to be aired and discussed.