what do they base this on?

NRA Members Echo Fiery Right-Wing Anti-Obama Rhetoric: ‘He Hates The Second Amendment’
(Think Progress)
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Even though gun control hasn't even been on Obama's radar in his campaign or while he has been in office, this bizarre conspiracy theory continues to take hold. I know that Fox does their job in spreading this myth, but doesn't anyone ever look for themselves to see what reality is?

I guess that's a silly question...